1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* Process declarations and symbol lookup for C front end.
22 Also constructs types; the standard scalar types at initialization,
23 and structure, union, array and enum types when they are declared. */
25 /* ??? not all decl nodes are given the most useful possible
26 line numbers. For example, the CONST_DECLs for enum values. */
35 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
37 { NORMAL, /* Ordinary declaration */
38 FUNCDEF, /* Function definition */
39 PARM, /* Declaration of parm before function body */
40 FIELD, /* Declaration inside struct or union */
41 BITFIELD, /* Likewise but with specified width */
42 TYPENAME}; /* Typename (inside cast or sizeof) */
44 #ifndef CHAR_TYPE_SIZE
45 #define CHAR_TYPE_SIZE BITS_PER_UNIT
48 #ifndef SHORT_TYPE_SIZE
49 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
53 #define INT_TYPE_SIZE BITS_PER_WORD
56 #ifndef LONG_TYPE_SIZE
57 #define LONG_TYPE_SIZE BITS_PER_WORD
60 #ifndef LONG_LONG_TYPE_SIZE
61 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
64 #ifndef WCHAR_UNSIGNED
65 #define WCHAR_UNSIGNED 0
68 #ifndef FLOAT_TYPE_SIZE
69 #define FLOAT_TYPE_SIZE BITS_PER_WORD
72 #ifndef DOUBLE_TYPE_SIZE
73 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
76 #ifndef LONG_DOUBLE_TYPE_SIZE
77 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
80 /* We let tm.h override the types used here, to handle trivial differences
81 such as the choice of unsigned int or long unsigned int for size_t.
82 When machines start needing nontrivial differences in the size type,
83 it would be best to do something here to figure out automatically
84 from other information what type to use. */
87 #define SIZE_TYPE "long unsigned int"
91 #define PTRDIFF_TYPE "long int"
95 #define WCHAR_TYPE "int"
98 /* a node which has tree code ERROR_MARK, and whose type is itself.
99 All erroneous expressions are replaced with this node. All functions
100 that accept nodes as arguments should avoid generating error messages
101 if this node is one of the arguments, since it is undesirable to get
102 multiple error messages from one error in the input. */
104 tree error_mark_node;
106 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
108 tree short_integer_type_node;
109 tree integer_type_node;
110 tree long_integer_type_node;
111 tree long_long_integer_type_node;
113 tree short_unsigned_type_node;
114 tree unsigned_type_node;
115 tree long_unsigned_type_node;
116 tree long_long_unsigned_type_node;
118 tree ptrdiff_type_node;
120 tree unsigned_char_type_node;
121 tree signed_char_type_node;
123 tree wchar_type_node;
124 tree signed_wchar_type_node;
125 tree unsigned_wchar_type_node;
127 tree float_type_node;
128 tree double_type_node;
129 tree long_double_type_node;
131 tree complex_integer_type_node;
132 tree complex_float_type_node;
133 tree complex_double_type_node;
134 tree complex_long_double_type_node;
136 tree intQI_type_node;
137 tree intHI_type_node;
138 tree intSI_type_node;
139 tree intDI_type_node;
141 tree unsigned_intQI_type_node;
142 tree unsigned_intHI_type_node;
143 tree unsigned_intSI_type_node;
144 tree unsigned_intDI_type_node;
146 /* a VOID_TYPE node. */
150 /* Nodes for types `void *' and `const void *'. */
152 tree ptr_type_node, const_ptr_type_node;
154 /* Nodes for types `char *' and `const char *'. */
156 tree string_type_node, const_string_type_node;
158 /* Type `char[SOMENUMBER]'.
159 Used when an array of char is needed and the size is irrelevant. */
161 tree char_array_type_node;
163 /* Type `int[SOMENUMBER]' or something like it.
164 Used when an array of int needed and the size is irrelevant. */
166 tree int_array_type_node;
168 /* Type `wchar_t[SOMENUMBER]' or something like it.
169 Used when a wide string literal is created. */
171 tree wchar_array_type_node;
173 /* type `int ()' -- used for implicit declaration of functions. */
175 tree default_function_type;
177 /* function types `double (double)' and `double (double, double)', etc. */
179 tree double_ftype_double, double_ftype_double_double;
180 tree int_ftype_int, long_ftype_long;
182 /* Function type `void (void *, void *, int)' and similar ones */
184 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
186 /* Function type `char *(char *, char *)' and similar ones */
187 tree string_ftype_ptr_ptr, int_ftype_string_string;
189 /* Function type `int (const void *, const void *, size_t)' */
190 tree int_ftype_cptr_cptr_sizet;
192 /* Two expressions that are constants with value zero.
193 The first is of type `int', the second of type `void *'. */
195 tree integer_zero_node;
196 tree null_pointer_node;
198 /* A node for the integer constant 1. */
200 tree integer_one_node;
202 /* Nonzero if we have seen an invalid cross reference
203 to a struct, union, or enum, but not yet printed the message. */
205 tree pending_invalid_xref;
206 /* File and line to appear in the eventual error message. */
207 char *pending_invalid_xref_file;
208 int pending_invalid_xref_line;
210 /* While defining an enum type, this is 1 plus the last enumerator
211 constant value. Note that will do not have to save this or `enum_overflow'
212 around nested function definition since such a definition could only
213 occur in an enum value expression and we don't use these variables in
216 static tree enum_next_value;
218 /* Nonzero means that there was overflow computing enum_next_value. */
220 static int enum_overflow;
222 /* Parsing a function declarator leaves a list of parameter names
223 or a chain or parameter decls here. */
225 static tree last_function_parms;
227 /* Parsing a function declarator leaves here a chain of structure
228 and enum types declared in the parmlist. */
230 static tree last_function_parm_tags;
232 /* After parsing the declarator that starts a function definition,
233 `start_function' puts here the list of parameter names or chain of decls.
234 `store_parm_decls' finds it here. */
236 static tree current_function_parms;
238 /* Similar, for last_function_parm_tags. */
239 static tree current_function_parm_tags;
241 /* Similar, for the file and line that the prototype came from if this is
242 an old-style definition. */
243 static char *current_function_prototype_file;
244 static int current_function_prototype_line;
246 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
247 that have names. Here so we can clear out their names' definitions
248 at the end of the function. */
250 static tree named_labels;
252 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
254 static tree shadowed_labels;
256 /* Nonzero when store_parm_decls is called indicates a varargs function.
257 Value not meaningful after store_parm_decls. */
259 static int c_function_varargs;
261 /* The FUNCTION_DECL for the function currently being compiled,
262 or 0 if between functions. */
263 tree current_function_decl;
265 /* Set to 0 at beginning of a function definition, set to 1 if
266 a return statement that specifies a return value is seen. */
268 int current_function_returns_value;
270 /* Set to 0 at beginning of a function definition, set to 1 if
271 a return statement with no argument is seen. */
273 int current_function_returns_null;
275 /* Set to nonzero by `grokdeclarator' for a function
276 whose return type is defaulted, if warnings for this are desired. */
278 static int warn_about_return_type;
280 /* Nonzero when starting a function declared `extern inline'. */
282 static int current_extern_inline;
284 /* For each binding contour we allocate a binding_level structure
285 * which records the names defined in that contour.
288 * 1) one for each function definition,
289 * where internal declarations of the parameters appear.
290 * 2) one for each compound statement,
291 * to record its declarations.
293 * The current meaning of a name can be found by searching the levels from
294 * the current one out to the global one.
297 /* Note that the information in the `names' component of the global contour
298 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
302 /* A chain of _DECL nodes for all variables, constants, functions,
303 and typedef types. These are in the reverse of the order supplied.
307 /* A list of structure, union and enum definitions,
308 * for looking up tag names.
309 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
310 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
311 * or ENUMERAL_TYPE node.
315 /* For each level, a list of shadowed outer-level local definitions
316 to be restored when this level is popped.
317 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
318 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
321 /* For each level (except not the global one),
322 a chain of BLOCK nodes for all the levels
323 that were entered and exited one level down. */
326 /* The BLOCK node for this level, if one has been preallocated.
327 If 0, the BLOCK is allocated (if needed) when the level is popped. */
330 /* The binding level which this one is contained in (inherits from). */
331 struct binding_level *level_chain;
333 /* Nonzero for the level that holds the parameters of a function. */
336 /* Nonzero if this level "doesn't exist" for tags. */
337 char tag_transparent;
339 /* Nonzero if sublevels of this level "don't exist" for tags.
340 This is set in the parm level of a function definition
341 while reading the function body, so that the outermost block
342 of the function body will be tag-transparent. */
343 char subblocks_tag_transparent;
345 /* Nonzero means make a BLOCK for this level regardless of all else. */
348 /* Nonzero means make a BLOCK if this level has any subblocks. */
349 char keep_if_subblocks;
351 /* Number of decls in `names' that have incomplete
352 structure or union types. */
355 /* A list of decls giving the (reversed) specified order of parms,
356 not including any forward-decls in the parmlist.
357 This is so we can put the parms in proper order for assign_parms. */
361 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
363 /* The binding level currently in effect. */
365 static struct binding_level *current_binding_level;
367 /* A chain of binding_level structures awaiting reuse. */
369 static struct binding_level *free_binding_level;
371 /* The outermost binding level, for names of file scope.
372 This is created when the compiler is started and exists
373 through the entire run. */
375 static struct binding_level *global_binding_level;
377 /* Binding level structures are initialized by copying this one. */
379 static struct binding_level clear_binding_level
380 = {NULL, NULL, NULL, NULL, NULL, NULL, 0, 0, 0};
382 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
384 static int keep_next_level_flag;
386 /* Nonzero means make a BLOCK for the next level pushed
387 if it has subblocks. */
389 static int keep_next_if_subblocks;
391 /* The chain of outer levels of label scopes.
392 This uses the same data structure used for binding levels,
393 but it works differently: each link in the chain records
394 saved values of named_labels and shadowed_labels for
395 a label binding level outside the current one. */
397 static struct binding_level *label_level_chain;
399 /* Forward declarations. */
401 static tree grokparms (), grokdeclarator ();
403 tree builtin_function ();
404 void shadow_tag_warned ();
406 static tree lookup_tag ();
407 static tree lookup_tag_reverse ();
408 tree lookup_name_current_level ();
409 static char *redeclaration_error_message ();
410 static void layout_array_type ();
412 /* C-specific option variables. */
414 /* Nonzero means allow type mismatches in conditional expressions;
415 just make their values `void'. */
417 int flag_cond_mismatch;
419 /* Nonzero means give `double' the same size as `float'. */
421 int flag_short_double;
423 /* Nonzero means don't recognize the keyword `asm'. */
427 /* Nonzero means don't recognize any builtin functions. */
431 /* Nonzero means don't recognize the non-ANSI builtin functions.
434 int flag_no_nonansi_builtin;
436 /* Nonzero means do some things the same way PCC does. */
438 int flag_traditional;
440 /* Nonzero means to allow single precision math even if we're generally
441 being traditional. */
442 int flag_allow_single_precision = 0;
444 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
446 int flag_signed_bitfields = 1;
447 int explicit_flag_signed_bitfields = 0;
449 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
451 int flag_no_ident = 0;
453 /* Nonzero means warn about implicit declarations. */
457 /* Nonzero means give string constants the type `const char *'
458 to get extra warnings from them. These warnings will be too numerous
459 to be useful, except in thoroughly ANSIfied programs. */
461 int warn_write_strings;
463 /* Nonzero means warn about pointer casts that can drop a type qualifier
464 from the pointer target type. */
468 /* Warn about traditional constructs whose meanings changed in ANSI C. */
470 int warn_traditional;
472 /* Nonzero means warn about sizeof(function) or addition/subtraction
473 of function pointers. */
475 int warn_pointer_arith;
477 /* Nonzero means warn for non-prototype function decls
478 or non-prototyped defs without previous prototype. */
480 int warn_strict_prototypes;
482 /* Nonzero means warn for any global function def
483 without separate previous prototype decl. */
485 int warn_missing_prototypes;
487 /* Nonzero means warn about multiple (redundant) decls for the same single
488 variable or function. */
490 int warn_redundant_decls = 0;
492 /* Nonzero means warn about extern declarations of objects not at
493 file-scope level and about *all* declarations of functions (whether
494 extern or static) not at file-scope level. Note that we exclude
495 implicit function declarations. To get warnings about those, use
498 int warn_nested_externs = 0;
500 /* Warn about *printf or *scanf format/argument anomalies. */
504 /* Warn about a subscript that has type char. */
506 int warn_char_subscripts = 0;
508 /* Warn if a type conversion is done that might have confusing results. */
512 /* Warn if adding () is suggested. */
514 int warn_parentheses;
516 /* Warn if initializer is not completely bracketed. */
518 int warn_missing_braces;
520 /* Nonzero means `$' can be in an identifier.
521 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
523 #ifndef DOLLARS_IN_IDENTIFIERS
524 #define DOLLARS_IN_IDENTIFIERS 1
526 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
528 /* Decode the string P as a language-specific option for C.
529 Return 1 if it is recognized (and handle it);
530 return 0 if not recognized. */
536 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
538 flag_traditional = 1;
539 flag_writable_strings = 1;
540 #if DOLLARS_IN_IDENTIFIERS > 0
541 dollars_in_ident = 1;
544 else if (!strcmp (p, "-fallow-single-precision"))
545 flag_allow_single_precision = 1;
546 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
548 flag_traditional = 0;
549 flag_writable_strings = 0;
550 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
552 else if (!strcmp (p, "-fdollars-in-identifiers"))
554 #if DOLLARS_IN_IDENTIFIERS > 0
555 dollars_in_ident = 1;
558 else if (!strcmp (p, "-fnodollars-in-identifiers"))
559 dollars_in_ident = 0;
560 else if (!strcmp (p, "-fsigned-char"))
561 flag_signed_char = 1;
562 else if (!strcmp (p, "-funsigned-char"))
563 flag_signed_char = 0;
564 else if (!strcmp (p, "-fno-signed-char"))
565 flag_signed_char = 0;
566 else if (!strcmp (p, "-fno-unsigned-char"))
567 flag_signed_char = 1;
568 else if (!strcmp (p, "-fsigned-bitfields")
569 || !strcmp (p, "-fno-unsigned-bitfields"))
571 flag_signed_bitfields = 1;
572 explicit_flag_signed_bitfields = 1;
574 else if (!strcmp (p, "-funsigned-bitfields")
575 || !strcmp (p, "-fno-signed-bitfields"))
577 flag_signed_bitfields = 0;
578 explicit_flag_signed_bitfields = 1;
580 else if (!strcmp (p, "-fshort-enums"))
581 flag_short_enums = 1;
582 else if (!strcmp (p, "-fno-short-enums"))
583 flag_short_enums = 0;
584 else if (!strcmp (p, "-fcond-mismatch"))
585 flag_cond_mismatch = 1;
586 else if (!strcmp (p, "-fno-cond-mismatch"))
587 flag_cond_mismatch = 0;
588 else if (!strcmp (p, "-fshort-double"))
589 flag_short_double = 1;
590 else if (!strcmp (p, "-fno-short-double"))
591 flag_short_double = 0;
592 else if (!strcmp (p, "-fasm"))
594 else if (!strcmp (p, "-fno-asm"))
596 else if (!strcmp (p, "-fbuiltin"))
598 else if (!strcmp (p, "-fno-builtin"))
600 else if (!strcmp (p, "-fno-ident"))
602 else if (!strcmp (p, "-fident"))
604 else if (!strcmp (p, "-ansi"))
605 flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0;
606 else if (!strcmp (p, "-Wimplicit"))
608 else if (!strcmp (p, "-Wno-implicit"))
610 else if (!strcmp (p, "-Wwrite-strings"))
611 warn_write_strings = 1;
612 else if (!strcmp (p, "-Wno-write-strings"))
613 warn_write_strings = 0;
614 else if (!strcmp (p, "-Wcast-qual"))
616 else if (!strcmp (p, "-Wno-cast-qual"))
618 else if (!strcmp (p, "-Wpointer-arith"))
619 warn_pointer_arith = 1;
620 else if (!strcmp (p, "-Wno-pointer-arith"))
621 warn_pointer_arith = 0;
622 else if (!strcmp (p, "-Wstrict-prototypes"))
623 warn_strict_prototypes = 1;
624 else if (!strcmp (p, "-Wno-strict-prototypes"))
625 warn_strict_prototypes = 0;
626 else if (!strcmp (p, "-Wmissing-prototypes"))
627 warn_missing_prototypes = 1;
628 else if (!strcmp (p, "-Wno-missing-prototypes"))
629 warn_missing_prototypes = 0;
630 else if (!strcmp (p, "-Wredundant-decls"))
631 warn_redundant_decls = 1;
632 else if (!strcmp (p, "-Wno-redundant-decls"))
633 warn_redundant_decls = 0;
634 else if (!strcmp (p, "-Wnested-externs"))
635 warn_nested_externs = 1;
636 else if (!strcmp (p, "-Wno-nested-externs"))
637 warn_nested_externs = 0;
638 else if (!strcmp (p, "-Wtraditional"))
639 warn_traditional = 1;
640 else if (!strcmp (p, "-Wno-traditional"))
641 warn_traditional = 0;
642 else if (!strcmp (p, "-Wformat"))
644 else if (!strcmp (p, "-Wno-format"))
646 else if (!strcmp (p, "-Wchar-subscripts"))
647 warn_char_subscripts = 1;
648 else if (!strcmp (p, "-Wno-char-subscripts"))
649 warn_char_subscripts = 0;
650 else if (!strcmp (p, "-Wconversion"))
652 else if (!strcmp (p, "-Wno-conversion"))
654 else if (!strcmp (p, "-Wparentheses"))
655 warn_parentheses = 1;
656 else if (!strcmp (p, "-Wno-parentheses"))
657 warn_parentheses = 0;
658 else if (!strcmp (p, "-Wreturn-type"))
659 warn_return_type = 1;
660 else if (!strcmp (p, "-Wno-return-type"))
661 warn_return_type = 0;
662 else if (!strcmp (p, "-Wcomment"))
663 ; /* cpp handles this one. */
664 else if (!strcmp (p, "-Wno-comment"))
665 ; /* cpp handles this one. */
666 else if (!strcmp (p, "-Wcomments"))
667 ; /* cpp handles this one. */
668 else if (!strcmp (p, "-Wno-comments"))
669 ; /* cpp handles this one. */
670 else if (!strcmp (p, "-Wtrigraphs"))
671 ; /* cpp handles this one. */
672 else if (!strcmp (p, "-Wno-trigraphs"))
673 ; /* cpp handles this one. */
674 else if (!strcmp (p, "-Wimport"))
675 ; /* cpp handles this one. */
676 else if (!strcmp (p, "-Wno-import"))
677 ; /* cpp handles this one. */
678 else if (!strcmp (p, "-Wmissing-braces"))
679 warn_missing_braces = 1;
680 else if (!strcmp (p, "-Wno-missing-braces"))
681 warn_missing_braces = 0;
682 else if (!strcmp (p, "-Wall"))
685 /* We save the value of warn_uninitialized, since if they put
686 -Wuninitialized on the command line, we need to generate a
687 warning about not using it without also specifying -O. */
688 if (warn_uninitialized != 1)
689 warn_uninitialized = 2;
691 warn_return_type = 1;
695 warn_char_subscripts = 1;
696 warn_parentheses = 1;
697 warn_missing_braces = 1;
705 /* Hooks for print_node. */
708 print_lang_decl (file, node, indent)
716 print_lang_type (file, node, indent)
724 print_lang_identifier (file, node, indent)
729 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
730 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
731 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
732 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
733 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
734 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
737 /* Hook called at end of compilation to assume 1 elt
738 for a top-level array decl that wasn't complete before. */
741 finish_incomplete_decl (decl)
744 if (TREE_CODE (decl) == VAR_DECL && TREE_TYPE (decl) != error_mark_node)
746 tree type = TREE_TYPE (decl);
747 if (TREE_CODE (type) == ARRAY_TYPE
748 && TYPE_DOMAIN (type) == 0
749 && TREE_CODE (decl) != TYPE_DECL)
751 complete_array_type (type, NULL_TREE, 1);
753 layout_decl (decl, 0);
758 /* Create a new `struct binding_level'. */
761 struct binding_level *
762 make_binding_level ()
765 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
768 /* Nonzero if we are currently in the global binding level. */
773 return current_binding_level == global_binding_level;
779 keep_next_level_flag = 1;
782 /* Nonzero if the current level needs to have a BLOCK made. */
787 return ((current_binding_level->keep_if_subblocks
788 && current_binding_level->blocks != 0)
789 || current_binding_level->keep
790 || current_binding_level->names != 0
791 || (current_binding_level->tags != 0
792 && !current_binding_level->tag_transparent));
795 /* Identify this binding level as a level of parameters.
796 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
797 But it turns out there is no way to pass the right value for
798 DEFINITION_FLAG, so we ignore it. */
801 declare_parm_level (definition_flag)
804 current_binding_level->parm_flag = 1;
807 /* Nonzero if currently making parm declarations. */
812 return current_binding_level->parm_flag;
815 /* Enter a new binding level.
816 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
817 not for that of tags. */
820 pushlevel (tag_transparent)
823 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
825 /* If this is the top level of a function,
826 just make sure that NAMED_LABELS is 0. */
828 if (current_binding_level == global_binding_level)
833 /* Reuse or create a struct for this binding level. */
835 if (free_binding_level)
837 newlevel = free_binding_level;
838 free_binding_level = free_binding_level->level_chain;
842 newlevel = make_binding_level ();
845 /* Add this level to the front of the chain (stack) of levels that
848 *newlevel = clear_binding_level;
849 newlevel->tag_transparent
851 || (current_binding_level
852 ? current_binding_level->subblocks_tag_transparent
854 newlevel->level_chain = current_binding_level;
855 current_binding_level = newlevel;
856 newlevel->keep = keep_next_level_flag;
857 keep_next_level_flag = 0;
858 newlevel->keep_if_subblocks = keep_next_if_subblocks;
859 keep_next_if_subblocks = 0;
862 /* Exit a binding level.
863 Pop the level off, and restore the state of the identifier-decl mappings
864 that were in effect when this level was entered.
866 If KEEP is nonzero, this level had explicit declarations, so
867 and create a "block" (a BLOCK node) for the level
868 to record its declarations and subblocks for symbol table output.
870 If FUNCTIONBODY is nonzero, this level is the body of a function,
871 so create a block as if KEEP were set and also clear out all
874 If REVERSE is nonzero, reverse the order of decls before putting
875 them into the BLOCK. */
878 poplevel (keep, reverse, functionbody)
884 /* The chain of decls was accumulated in reverse order.
885 Put it into forward order, just for cleanliness. */
887 tree tags = current_binding_level->tags;
888 tree subblocks = current_binding_level->blocks;
891 int block_previously_created;
893 keep |= current_binding_level->keep;
895 /* This warning is turned off because it causes warnings for
896 declarations like `extern struct foo *x'. */
898 /* Warn about incomplete structure types in this level. */
899 for (link = tags; link; link = TREE_CHAIN (link))
900 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
902 tree type = TREE_VALUE (link);
904 switch (TREE_CODE (type))
907 errmsg = "`struct %s' incomplete in scope ending here";
910 errmsg = "`union %s' incomplete in scope ending here";
913 errmsg = "`enum %s' incomplete in scope ending here";
916 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
917 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
919 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
920 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
924 /* Get the decls in the order they were written.
925 Usually current_binding_level->names is in reverse order.
926 But parameter decls were previously put in forward order. */
929 current_binding_level->names
930 = decls = nreverse (current_binding_level->names);
932 decls = current_binding_level->names;
934 /* Output any nested inline functions within this block
935 if they weren't already output. */
937 for (decl = decls; decl; decl = TREE_CHAIN (decl))
938 if (TREE_CODE (decl) == FUNCTION_DECL
939 && ! TREE_ASM_WRITTEN (decl)
940 && DECL_INITIAL (decl) != 0
941 && TREE_ADDRESSABLE (decl))
943 /* If this decl was copied from a file-scope decl
944 on account of a block-scope extern decl,
945 propagate TREE_ADDRESSABLE to the file-scope decl. */
946 if (DECL_ABSTRACT_ORIGIN (decl) != 0)
947 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
950 push_function_context ();
951 output_inline_function (decl);
952 pop_function_context ();
956 /* If there were any declarations or structure tags in that level,
957 or if this level is a function body,
958 create a BLOCK to record them for the life of this function. */
961 block_previously_created = (current_binding_level->this_block != 0);
962 if (block_previously_created)
963 block = current_binding_level->this_block;
964 else if (keep || functionbody
965 || (current_binding_level->keep_if_subblocks && subblocks != 0))
966 block = make_node (BLOCK);
969 BLOCK_VARS (block) = decls;
970 BLOCK_TYPE_TAGS (block) = tags;
971 BLOCK_SUBBLOCKS (block) = subblocks;
972 remember_end_note (block);
975 /* In each subblock, record that this is its superior. */
977 for (link = subblocks; link; link = TREE_CHAIN (link))
978 BLOCK_SUPERCONTEXT (link) = block;
980 /* Clear out the meanings of the local variables of this level. */
982 for (link = decls; link; link = TREE_CHAIN (link))
984 if (DECL_NAME (link) != 0)
986 /* If the ident. was used or addressed via a local extern decl,
987 don't forget that fact. */
988 if (DECL_EXTERNAL (link))
990 if (TREE_USED (link))
991 TREE_USED (DECL_NAME (link)) = 1;
992 if (TREE_ADDRESSABLE (link))
993 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
995 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
999 /* Restore all name-meanings of the outer levels
1000 that were shadowed by this level. */
1002 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1003 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1005 /* If the level being exited is the top level of a function,
1006 check over all the labels, and clear out the current
1007 (function local) meanings of their names. */
1011 /* If this is the top level block of a function,
1012 the vars are the function's parameters.
1013 Don't leave them in the BLOCK because they are
1014 found in the FUNCTION_DECL instead. */
1016 BLOCK_VARS (block) = 0;
1018 /* Clear out the definitions of all label names,
1019 since their scopes end here,
1020 and add them to BLOCK_VARS. */
1022 for (link = named_labels; link; link = TREE_CHAIN (link))
1024 register tree label = TREE_VALUE (link);
1026 if (DECL_INITIAL (label) == 0)
1028 error_with_decl (label, "label `%s' used but not defined");
1029 /* Avoid crashing later. */
1030 define_label (input_filename, lineno,
1033 else if (warn_unused && !TREE_USED (label))
1034 warning_with_decl (label, "label `%s' defined but not used");
1035 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1037 /* Put the labels into the "variables" of the
1038 top-level block, so debugger can see them. */
1039 TREE_CHAIN (label) = BLOCK_VARS (block);
1040 BLOCK_VARS (block) = label;
1044 /* Pop the current level, and free the structure for reuse. */
1047 register struct binding_level *level = current_binding_level;
1048 current_binding_level = current_binding_level->level_chain;
1050 level->level_chain = free_binding_level;
1051 free_binding_level = level;
1054 /* Dispose of the block that we just made inside some higher level. */
1056 DECL_INITIAL (current_function_decl) = block;
1059 if (!block_previously_created)
1060 current_binding_level->blocks
1061 = chainon (current_binding_level->blocks, block);
1063 /* If we did not make a block for the level just exited,
1064 any blocks made for inner levels
1065 (since they cannot be recorded as subblocks in that level)
1066 must be carried forward so they will later become subblocks
1067 of something else. */
1069 current_binding_level->blocks
1070 = chainon (current_binding_level->blocks, subblocks);
1072 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1073 binding contour so that they point to the appropriate construct, i.e.
1074 either to the current FUNCTION_DECL node, or else to the BLOCK node
1075 we just constructed.
1077 Note that for tagged types whose scope is just the formal parameter
1078 list for some function type specification, we can't properly set
1079 their TYPE_CONTEXTs here, because we don't have a pointer to the
1080 appropriate FUNCTION_TYPE node readily available to us. For those
1081 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1082 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1083 node which will represent the "scope" for these "parameter list local"
1088 for (link = tags; link; link = TREE_CHAIN (link))
1089 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1091 for (link = tags; link; link = TREE_CHAIN (link))
1092 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1095 TREE_USED (block) = 1;
1099 /* Delete the node BLOCK from the current binding level.
1100 This is used for the block inside a stmt expr ({...})
1101 so that the block can be reinserted where appropriate. */
1104 delete_block (block)
1108 if (current_binding_level->blocks == block)
1109 current_binding_level->blocks = TREE_CHAIN (block);
1110 for (t = current_binding_level->blocks; t;)
1112 if (TREE_CHAIN (t) == block)
1113 TREE_CHAIN (t) = TREE_CHAIN (block);
1117 TREE_CHAIN (block) = NULL;
1118 /* Clear TREE_USED which is always set by poplevel.
1119 The flag is set again if insert_block is called. */
1120 TREE_USED (block) = 0;
1123 /* Insert BLOCK at the end of the list of subblocks of the
1124 current binding level. This is used when a BIND_EXPR is expanded,
1125 to handle the BLOCK node inside the BIND_EXPR. */
1128 insert_block (block)
1131 TREE_USED (block) = 1;
1132 current_binding_level->blocks
1133 = chainon (current_binding_level->blocks, block);
1136 /* Set the BLOCK node for the innermost scope
1137 (the one we are currently in). */
1141 register tree block;
1143 current_binding_level->this_block = block;
1149 register struct binding_level *newlevel;
1151 /* Reuse or create a struct for this binding level. */
1153 if (free_binding_level)
1155 newlevel = free_binding_level;
1156 free_binding_level = free_binding_level->level_chain;
1160 newlevel = make_binding_level ();
1163 /* Add this level to the front of the chain (stack) of label levels. */
1165 newlevel->level_chain = label_level_chain;
1166 label_level_chain = newlevel;
1168 newlevel->names = named_labels;
1169 newlevel->shadowed = shadowed_labels;
1171 shadowed_labels = 0;
1177 register struct binding_level *level = label_level_chain;
1180 /* Clear out the definitions of the declared labels in this level.
1181 Leave in the list any ordinary, non-declared labels. */
1182 for (link = named_labels, prev = 0; link;)
1184 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1186 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1188 error_with_decl (TREE_VALUE (link),
1189 "label `%s' used but not defined");
1190 /* Avoid crashing later. */
1191 define_label (input_filename, lineno,
1192 DECL_NAME (TREE_VALUE (link)));
1194 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1195 warning_with_decl (TREE_VALUE (link),
1196 "label `%s' defined but not used");
1197 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1199 /* Delete this element from the list. */
1200 link = TREE_CHAIN (link);
1202 TREE_CHAIN (prev) = link;
1204 named_labels = link;
1209 link = TREE_CHAIN (link);
1213 /* Bring back all the labels that were shadowed. */
1214 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1215 if (DECL_NAME (TREE_VALUE (link)) != 0)
1216 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1217 = TREE_VALUE (link);
1219 named_labels = chainon (named_labels, level->names);
1220 shadowed_labels = level->shadowed;
1222 /* Pop the current level, and free the structure for reuse. */
1223 label_level_chain = label_level_chain->level_chain;
1224 level->level_chain = free_binding_level;
1225 free_binding_level = level;
1228 /* Push a definition or a declaration of struct, union or enum tag "name".
1229 "type" should be the type node.
1230 We assume that the tag "name" is not already defined.
1232 Note that the definition may really be just a forward reference.
1233 In that case, the TYPE_SIZE will be zero. */
1236 pushtag (name, type)
1239 register struct binding_level *b;
1241 /* Find the proper binding level for this type tag. */
1243 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1248 /* Record the identifier as the type's name if it has none. */
1250 if (TYPE_NAME (type) == 0)
1251 TYPE_NAME (type) = name;
1254 if (b == global_binding_level)
1255 b->tags = perm_tree_cons (name, type, b->tags);
1257 b->tags = saveable_tree_cons (name, type, b->tags);
1259 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1260 tagged type we just added to the current binding level. This fake
1261 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1262 to output a representation of a tagged type, and it also gives
1263 us a convenient place to record the "scope start" address for the
1266 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1269 /* Handle when a new declaration NEWDECL
1270 has the same name as an old one OLDDECL
1271 in the same binding contour.
1272 Prints an error message if appropriate.
1274 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1275 Otherwise, return 0. */
1278 duplicate_decls (newdecl, olddecl)
1279 register tree newdecl, olddecl;
1281 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1282 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1283 && DECL_INITIAL (newdecl) != 0);
1284 tree oldtype = TREE_TYPE (olddecl);
1285 tree newtype = TREE_TYPE (newdecl);
1287 if (TREE_CODE (newtype) == ERROR_MARK
1288 || TREE_CODE (oldtype) == ERROR_MARK)
1291 /* New decl is completely inconsistent with the old one =>
1292 tell caller to replace the old one.
1293 This is always an error except in the case of shadowing a builtin. */
1294 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1296 if (TREE_CODE (olddecl) == FUNCTION_DECL
1297 && (DECL_BUILT_IN (olddecl)
1298 || DECL_BUILT_IN_NONANSI (olddecl)))
1300 /* If you declare a built-in or predefined function name as static,
1301 the old definition is overridden,
1302 but optionally warn this was a bad choice of name. */
1303 if (!TREE_PUBLIC (newdecl))
1307 else if (DECL_BUILT_IN (olddecl))
1308 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1310 warning_with_decl (newdecl, "shadowing library function `%s'");
1312 /* Likewise, if the built-in is not ansi, then programs can
1313 override it even globally without an error. */
1314 else if (! DECL_BUILT_IN (olddecl))
1315 warning_with_decl (newdecl,
1316 "library function `%s' declared as non-function");
1318 else if (DECL_BUILT_IN_NONANSI (olddecl))
1319 warning_with_decl (newdecl,
1320 "built-in function `%s' declared as non-function");
1322 warning_with_decl (newdecl,
1323 "built-in function `%s' declared as non-function");
1327 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1328 error_with_decl (olddecl, "previous declaration of `%s'");
1334 /* For real parm decl following a forward decl,
1335 return 1 so old decl will be reused. */
1336 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1337 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1340 /* The new declaration is the same kind of object as the old one.
1341 The declarations may partially match. Print warnings if they don't
1342 match enough. Ultimately, copy most of the information from the new
1343 decl to the old one, and keep using the old one. */
1345 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1346 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1347 && DECL_INITIAL (olddecl) == 0)
1348 /* If -traditional, avoid error for redeclaring fcn
1349 after implicit decl. */
1351 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1352 && DECL_BUILT_IN (olddecl))
1354 /* A function declaration for a built-in function. */
1355 if (!TREE_PUBLIC (newdecl))
1357 /* If you declare a built-in function name as static, the
1358 built-in definition is overridden,
1359 but optionally warn this was a bad choice of name. */
1361 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1362 /* Discard the old built-in function. */
1365 else if (!types_match)
1367 /* Accept the return type of the new declaration if same modes. */
1368 tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl));
1369 tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
1370 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1372 /* Function types may be shared, so we can't just modify
1373 the return type of olddecl's function type. */
1375 = build_function_type (newreturntype,
1376 TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
1378 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1380 TREE_TYPE (olddecl) = newtype;
1382 /* Accept harmless mismatch in first argument type also.
1384 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1385 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0
1386 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))) != 0
1387 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))) != 0
1388 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))))
1390 TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))))))
1392 /* Function types may be shared, so we can't just modify
1393 the return type of olddecl's function type. */
1395 = build_function_type (TREE_TYPE (TREE_TYPE (olddecl)),
1396 tree_cons (NULL_TREE,
1397 TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))),
1398 TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (olddecl)))));
1400 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1402 TREE_TYPE (olddecl) = newtype;
1407 /* If types don't match for a built-in, throw away the built-in. */
1408 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1412 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1413 && DECL_SOURCE_LINE (olddecl) == 0)
1415 /* A function declaration for a predeclared function
1416 that isn't actually built in. */
1417 if (!TREE_PUBLIC (newdecl))
1419 /* If you declare it as static, the
1420 default definition is overridden. */
1423 else if (!types_match)
1425 /* If the types don't match, preserve volatility indication.
1426 Later on, we will discard everything else about the
1427 default declaration. */
1428 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1431 /* Permit char *foo () to match void *foo (...) if not pedantic,
1432 if one of them came from a system header file. */
1433 else if (!types_match
1434 && TREE_CODE (olddecl) == FUNCTION_DECL
1435 && TREE_CODE (newdecl) == FUNCTION_DECL
1436 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1437 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1438 && (DECL_IN_SYSTEM_HEADER (olddecl)
1439 || DECL_IN_SYSTEM_HEADER (newdecl))
1440 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1441 && TYPE_ARG_TYPES (oldtype) == 0
1442 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1443 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1445 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1446 && TYPE_ARG_TYPES (newtype) == 0
1447 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1448 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1451 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1452 /* Make sure we keep void * as ret type, not char *. */
1453 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1454 TREE_TYPE (newdecl) = newtype = oldtype;
1456 else if (!types_match
1457 /* Permit char *foo (int, ...); followed by char *foo ();
1459 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1461 /* Return types must still match. */
1462 && comptypes (TREE_TYPE (oldtype),
1463 TREE_TYPE (newtype))
1464 && TYPE_ARG_TYPES (newtype) == 0))
1466 error_with_decl (newdecl, "conflicting types for `%s'");
1467 /* Check for function type mismatch
1468 involving an empty arglist vs a nonempty one. */
1469 if (TREE_CODE (olddecl) == FUNCTION_DECL
1470 && comptypes (TREE_TYPE (oldtype),
1471 TREE_TYPE (newtype))
1472 && ((TYPE_ARG_TYPES (oldtype) == 0
1473 && DECL_INITIAL (olddecl) == 0)
1475 (TYPE_ARG_TYPES (newtype) == 0
1476 && DECL_INITIAL (newdecl) == 0)))
1478 /* Classify the problem further. */
1479 register tree t = TYPE_ARG_TYPES (oldtype);
1481 t = TYPE_ARG_TYPES (newtype);
1482 for (; t; t = TREE_CHAIN (t))
1484 register tree type = TREE_VALUE (t);
1486 if (TREE_CHAIN (t) == 0
1487 && TYPE_MAIN_VARIANT (type) != void_type_node)
1489 error ("A parameter list with an ellipsis can't match");
1490 error ("an empty parameter name list declaration.");
1494 if (TYPE_MAIN_VARIANT (type) == float_type_node
1495 || C_PROMOTING_INTEGER_TYPE_P (type))
1497 error ("An argument type that has a default promotion");
1498 error ("can't match an empty parameter name list declaration.");
1503 error_with_decl (olddecl, "previous declaration of `%s'");
1507 char *errmsg = redeclaration_error_message (newdecl, olddecl);
1510 error_with_decl (newdecl, errmsg);
1511 error_with_decl (olddecl,
1512 ((DECL_INITIAL (olddecl)
1513 && current_binding_level == global_binding_level)
1514 ? "`%s' previously defined here"
1515 : "`%s' previously declared here"));
1517 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1518 && DECL_INITIAL (olddecl) != 0
1519 && TYPE_ARG_TYPES (oldtype) == 0
1520 && TYPE_ARG_TYPES (newtype) != 0)
1522 register tree type, parm;
1524 /* Prototype decl follows defn w/o prototype. */
1526 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1527 type = TYPE_ARG_TYPES (newtype),
1529 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1530 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1531 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1533 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1534 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1536 errmsg = "prototype for `%s' follows and number of arguments";
1539 /* Type for passing arg must be consistent
1540 with that declared for the arg. */
1541 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1542 /* If -traditional, allow `unsigned int' instead of `int'
1543 in the prototype. */
1544 && (! (flag_traditional
1545 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1546 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1548 errmsg = "prototype for `%s' follows and argument %d";
1554 error_with_decl (newdecl, errmsg, nargs);
1555 error_with_decl (olddecl,
1556 "doesn't match non-prototype definition here");
1560 warning_with_decl (newdecl, "prototype for `%s' follows");
1561 warning_with_decl (olddecl, "non-prototype definition here");
1564 /* Warn about mismatches in various flags. */
1567 /* Warn if function is now inline
1568 but was previously declared not inline and has been called. */
1569 if (TREE_CODE (olddecl) == FUNCTION_DECL
1570 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1571 && TREE_USED (olddecl))
1572 warning_with_decl (newdecl,
1573 "`%s' declared inline after being called");
1574 if (TREE_CODE (olddecl) == FUNCTION_DECL
1575 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1576 && DECL_INITIAL (olddecl) != 0)
1577 warning_with_decl (newdecl,
1578 "`%s' declared inline after its definition");
1579 /* It is nice to warn when a function is declared
1580 global first and then static. */
1581 if (TREE_CODE (olddecl) == FUNCTION_DECL
1582 && TREE_PUBLIC (olddecl)
1583 && !TREE_PUBLIC (newdecl))
1584 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1586 /* These bits are logically part of the type, for variables.
1587 But not for functions
1588 (where qualifiers are not valid ANSI anyway). */
1589 if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1590 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1591 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1592 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1596 /* Optionally warn about more than one declaration for the same name. */
1597 if (warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1598 /* Dont warn about a function declaration
1599 followed by a definition. */
1600 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1601 && DECL_INITIAL (olddecl) == 0)
1602 /* Don't warn about extern decl followed by (tentative) definition. */
1603 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1605 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1606 warning_with_decl (olddecl, "previous declaration of `%s'");
1609 /* Copy all the DECL_... slots specified in the new decl
1610 except for any that we copy here from the old type.
1612 Past this point, we don't change OLDTYPE and NEWTYPE
1613 even if we change the types of NEWDECL and OLDDECL. */
1617 /* Merge the data types specified in the two decls. */
1618 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1620 = TREE_TYPE (olddecl)
1621 = common_type (newtype, oldtype);
1623 /* Lay the type out, unless already done. */
1624 if (oldtype != TREE_TYPE (newdecl))
1626 if (TREE_TYPE (newdecl) != error_mark_node)
1627 layout_type (TREE_TYPE (newdecl));
1628 if (TREE_CODE (newdecl) != FUNCTION_DECL
1629 && TREE_CODE (newdecl) != TYPE_DECL
1630 && TREE_CODE (newdecl) != CONST_DECL)
1631 layout_decl (newdecl, 0);
1635 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1636 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1637 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1638 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1639 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1642 /* Keep the old rtl since we can safely use it. */
1643 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1645 /* Merge the type qualifiers. */
1646 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1647 && !TREE_THIS_VOLATILE (newdecl))
1648 TREE_THIS_VOLATILE (olddecl) = 0;
1649 if (TREE_READONLY (newdecl))
1650 TREE_READONLY (olddecl) = 1;
1651 if (TREE_THIS_VOLATILE (newdecl))
1653 TREE_THIS_VOLATILE (olddecl) = 1;
1654 if (TREE_CODE (newdecl) == VAR_DECL)
1655 make_var_volatile (newdecl);
1658 /* Keep source location of definition rather than declaration. */
1659 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1661 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1662 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1665 /* Merge the unused-warning information. */
1666 if (DECL_IN_SYSTEM_HEADER (olddecl))
1667 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1668 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1669 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1671 /* Merge the initialization information. */
1672 if (DECL_INITIAL (newdecl) == 0)
1673 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1675 /* Merge the section attribute.
1676 We want to issue an error if the sections conflict but that must be
1677 done later in decl_attributes since we are called before attributes
1679 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1680 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1682 /* If cannot merge, then use the new type and qualifiers,
1683 and don't preserve the old rtl. */
1686 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1687 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1688 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1689 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1692 /* Merge the storage class information. */
1693 /* For functions, static overrides non-static. */
1694 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1696 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1697 /* This is since we don't automatically
1698 copy the attributes of NEWDECL into OLDDECL. */
1699 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1700 /* If this clears `static', clear it in the identifier too. */
1701 if (! TREE_PUBLIC (olddecl))
1702 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1704 if (DECL_EXTERNAL (newdecl))
1706 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1707 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1708 /* An extern decl does not override previous storage class. */
1709 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1713 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1714 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1717 /* If either decl says `inline', this fn is inline,
1718 unless its definition was passed already. */
1719 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1720 DECL_INLINE (olddecl) = 1;
1721 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1723 /* Get rid of any built-in function if new arg types don't match it
1724 or if we have a function definition. */
1725 if (TREE_CODE (newdecl) == FUNCTION_DECL
1726 && DECL_BUILT_IN (olddecl)
1727 && (!types_match || new_is_definition))
1729 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1730 DECL_BUILT_IN (olddecl) = 0;
1733 /* If redeclaring a builtin function, and not a definition,
1735 Also preserve various other info from the definition. */
1736 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1738 if (DECL_BUILT_IN (olddecl))
1740 DECL_BUILT_IN (newdecl) = 1;
1741 DECL_SET_FUNCTION_CODE (newdecl, DECL_FUNCTION_CODE (olddecl));
1744 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1746 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1747 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1748 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1749 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1752 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1753 But preserve OLDdECL's DECL_UID. */
1755 register unsigned olddecl_uid = DECL_UID (olddecl);
1757 bcopy ((char *) newdecl + sizeof (struct tree_common),
1758 (char *) olddecl + sizeof (struct tree_common),
1759 sizeof (struct tree_decl) - sizeof (struct tree_common));
1760 DECL_UID (olddecl) = olddecl_uid;
1766 /* Record a decl-node X as belonging to the current lexical scope.
1767 Check for errors (such as an incompatible declaration for the same
1768 name already seen in the same scope).
1770 Returns either X or an old decl for the same name.
1771 If an old decl is returned, it may have been smashed
1772 to agree with what X says. */
1779 register tree name = DECL_NAME (x);
1780 register struct binding_level *b = current_binding_level;
1782 DECL_CONTEXT (x) = current_function_decl;
1783 /* A local extern declaration for a function doesn't constitute nesting.
1784 A local auto declaration does, since it's a forward decl
1785 for a nested function coming later. */
1786 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1787 && DECL_EXTERNAL (x))
1788 DECL_CONTEXT (x) = 0;
1790 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1791 && x != IDENTIFIER_IMPLICIT_DECL (name)
1792 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1793 && !DECL_IN_SYSTEM_HEADER (x))
1794 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1801 t = lookup_name_current_level (name);
1802 if (t != 0 && t == error_mark_node)
1803 /* error_mark_node is 0 for a while during initialization! */
1806 error_with_decl (x, "`%s' used prior to declaration");
1811 file = DECL_SOURCE_FILE (t);
1812 line = DECL_SOURCE_LINE (t);
1815 if (t != 0 && duplicate_decls (x, t))
1817 if (TREE_CODE (t) == PARM_DECL)
1819 /* Don't allow more than one "real" duplicate
1820 of a forward parm decl. */
1821 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1824 /* If this decl is `static' and an implicit decl was seen previously,
1825 warn. But don't complain if -traditional,
1826 since traditional compilers don't complain. */
1827 if (!flag_traditional && TREE_PUBLIC (name)
1828 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1829 /* We used to warn also for explicit extern followed by static,
1830 but sometimes you need to do it that way. */
1831 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1833 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1834 IDENTIFIER_POINTER (name));
1835 pedwarn_with_file_and_line (file, line,
1836 "previous declaration of `%s'",
1837 IDENTIFIER_POINTER (name));
1843 /* If we are processing a typedef statement, generate a whole new
1844 ..._TYPE node (which will be just an variant of the existing
1845 ..._TYPE node with identical properties) and then install the
1846 TYPE_DECL node generated to represent the typedef name as the
1847 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1849 The whole point here is to end up with a situation where each
1850 and every ..._TYPE node the compiler creates will be uniquely
1851 associated with AT MOST one node representing a typedef name.
1852 This way, even though the compiler substitutes corresponding
1853 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1854 early on, later parts of the compiler can always do the reverse
1855 translation and get back the corresponding typedef name. For
1858 typedef struct S MY_TYPE;
1861 Later parts of the compiler might only know that `object' was of
1862 type `struct S' if if were not for code just below. With this
1863 code however, later parts of the compiler see something like:
1865 struct S' == struct S
1866 typedef struct S' MY_TYPE;
1869 And they can then deduce (from the node for type struct S') that
1870 the original object declaration was:
1874 Being able to do this is important for proper support of protoize,
1875 and also for generating precise symbolic debugging information
1876 which takes full account of the programmer's (typedef) vocabulary.
1878 Obviously, we don't want to generate a duplicate ..._TYPE node if
1879 the TYPE_DECL node that we are now processing really represents a
1880 standard built-in type.
1882 Since all standard types are effectively declared at line zero
1883 in the source file, we can easily check to see if we are working
1884 on a standard type by checking the current value of lineno. */
1886 if (TREE_CODE (x) == TYPE_DECL)
1888 if (DECL_SOURCE_LINE (x) == 0)
1890 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1891 TYPE_NAME (TREE_TYPE (x)) = x;
1893 else if (TREE_TYPE (x) != error_mark_node)
1895 tree tt = TREE_TYPE (x);
1897 tt = build_type_copy (tt);
1903 /* Multiple external decls of the same identifier ought to match.
1904 Check against both global declarations and out of scope (limbo) block
1907 We get warnings about inline functions where they are defined.
1908 Avoid duplicate warnings where they are used. */
1909 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
1913 if (IDENTIFIER_GLOBAL_VALUE (name) != 0
1914 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
1915 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
1916 decl = IDENTIFIER_GLOBAL_VALUE (name);
1917 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
1918 /* Decls in limbo are always extern, so no need to check that. */
1919 decl = IDENTIFIER_LIMBO_VALUE (name);
1923 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1924 /* If old decl is built-in, we already warned if we should. */
1925 && !DECL_BUILT_IN (decl))
1927 pedwarn_with_decl (x,
1928 "type mismatch with previous external decl");
1929 pedwarn_with_decl (decl, "previous external decl of `%s'");
1933 /* If a function has had an implicit declaration, and then is defined,
1934 make sure they are compatible. */
1936 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1937 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1938 && TREE_CODE (x) == FUNCTION_DECL
1939 && ! comptypes (TREE_TYPE (x),
1940 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1942 warning_with_decl (x, "type mismatch with previous implicit declaration");
1943 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1944 "previous implicit declaration of `%s'");
1947 /* In PCC-compatibility mode, extern decls of vars with no current decl
1948 take effect at top level no matter where they are. */
1949 if (flag_traditional && DECL_EXTERNAL (x)
1950 && lookup_name (name) == 0)
1952 tree type = TREE_TYPE (x);
1954 /* But don't do this if the type contains temporary nodes. */
1957 if (type == error_mark_node)
1959 if (! TREE_PERMANENT (type))
1961 warning_with_decl (x, "type of external `%s' is not global");
1962 /* By exiting the loop early, we leave TYPE nonzero,
1963 and thus prevent globalization of the decl. */
1966 else if (TREE_CODE (type) == FUNCTION_TYPE
1967 && TYPE_ARG_TYPES (type) != 0)
1968 /* The types might not be truly local,
1969 but the list of arg types certainly is temporary.
1970 Since prototypes are nontraditional,
1971 ok not to do the traditional thing. */
1973 type = TREE_TYPE (type);
1977 b = global_binding_level;
1980 /* This name is new in its binding level.
1981 Install the new declaration and return it. */
1982 if (b == global_binding_level)
1984 /* Install a global value. */
1986 /* If the first global decl has external linkage,
1987 warn if we later see static one. */
1988 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1989 TREE_PUBLIC (name) = 1;
1991 IDENTIFIER_GLOBAL_VALUE (name) = x;
1993 /* We no longer care about any previous block level declarations. */
1994 IDENTIFIER_LIMBO_VALUE (name) = 0;
1996 /* Don't forget if the function was used via an implicit decl. */
1997 if (IDENTIFIER_IMPLICIT_DECL (name)
1998 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
1999 TREE_USED (x) = 1, TREE_USED (name) = 1;
2001 /* Don't forget if its address was taken in that way. */
2002 if (IDENTIFIER_IMPLICIT_DECL (name)
2003 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2004 TREE_ADDRESSABLE (x) = 1;
2006 /* Warn about mismatches against previous implicit decl. */
2007 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2008 /* If this real decl matches the implicit, don't complain. */
2009 && ! (TREE_CODE (x) == FUNCTION_DECL
2010 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2011 == integer_type_node)))
2012 pedwarn ("`%s' was previously implicitly declared to return `int'",
2013 IDENTIFIER_POINTER (name));
2015 /* If this decl is `static' and an `extern' was seen previously,
2016 that is erroneous. */
2017 if (TREE_PUBLIC (name)
2018 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2020 /* Okay to redeclare an ANSI built-in as static. */
2021 if (t != 0 && DECL_BUILT_IN (t))
2023 /* Okay to declare a non-ANSI built-in as anything. */
2024 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2026 else if (IDENTIFIER_IMPLICIT_DECL (name))
2027 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2028 IDENTIFIER_POINTER (name));
2030 pedwarn ("`%s' was declared `extern' and later `static'",
2031 IDENTIFIER_POINTER (name));
2036 /* Here to install a non-global value. */
2037 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2038 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2039 IDENTIFIER_LOCAL_VALUE (name) = x;
2041 /* If this is an extern function declaration, see if we
2042 have a global definition or declaration for the function. */
2044 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2046 && TREE_CODE (x) == FUNCTION_DECL
2047 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2049 /* We have one. Their types must agree. */
2050 if (! comptypes (TREE_TYPE (x),
2051 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2052 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2055 /* Inner extern decl is inline if global one is.
2056 Copy enough to really inline it. */
2057 if (DECL_INLINE (oldglobal))
2059 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2060 DECL_INITIAL (x) = (current_function_decl == oldglobal
2061 ? 0 : DECL_INITIAL (oldglobal));
2062 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2063 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2064 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2065 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2066 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2067 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2069 /* Inner extern decl is built-in if global one is. */
2070 if (DECL_BUILT_IN (oldglobal))
2072 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2073 DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal));
2075 /* Keep the arg types from a file-scope fcn defn. */
2076 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2077 && DECL_INITIAL (oldglobal)
2078 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2079 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2083 #if 0 /* This case is probably sometimes the right thing to do. */
2084 /* If we have a local external declaration,
2085 then any file-scope declaration should not
2086 have been static. */
2087 if (oldlocal == 0 && oldglobal != 0
2088 && !TREE_PUBLIC (oldglobal)
2089 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2090 warning ("`%s' locally external but globally static",
2091 IDENTIFIER_POINTER (name));
2094 /* If we have a local external declaration,
2095 and no file-scope declaration has yet been seen,
2096 then if we later have a file-scope decl it must not be static. */
2099 && DECL_EXTERNAL (x)
2102 TREE_PUBLIC (name) = 1;
2104 /* Save this decl, so that we can do type checking against
2105 other decls after it falls out of scope.
2107 Only save it once. This prevents temporary decls created in
2108 expand_inline_function from being used here, since this
2109 will have been set when the inline function was parsed.
2110 It also helps give slightly better warnings. */
2111 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2112 IDENTIFIER_LIMBO_VALUE (name) = x;
2115 /* Warn if shadowing an argument at the top level of the body. */
2116 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2117 /* This warning doesn't apply to the parms of a nested fcn. */
2118 && ! current_binding_level->parm_flag
2119 /* Check that this is one level down from the parms. */
2120 && current_binding_level->level_chain->parm_flag
2121 /* Check that the decl being shadowed
2122 comes from the parm level, one level up. */
2123 && chain_member (oldlocal, current_binding_level->level_chain->names))
2125 if (TREE_CODE (oldlocal) == PARM_DECL)
2126 pedwarn ("declaration of `%s' shadows a parameter",
2127 IDENTIFIER_POINTER (name));
2129 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2130 IDENTIFIER_POINTER (name));
2133 /* Maybe warn if shadowing something else. */
2134 else if (warn_shadow && !DECL_EXTERNAL (x)
2135 /* No shadow warnings for internally generated vars. */
2136 && DECL_SOURCE_LINE (x) != 0
2137 /* No shadow warnings for vars made for inlining. */
2138 && ! DECL_FROM_INLINE (x))
2140 char *warnstring = 0;
2142 if (TREE_CODE (x) == PARM_DECL
2143 && current_binding_level->level_chain->parm_flag)
2144 /* Don't warn about the parm names in function declarator
2145 within a function declarator.
2146 It would be nice to avoid warning in any function
2147 declarator in a declaration, as opposed to a definition,
2148 but there is no way to tell it's not a definition. */
2150 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2151 warnstring = "declaration of `%s' shadows a parameter";
2152 else if (oldlocal != 0)
2153 warnstring = "declaration of `%s' shadows previous local";
2154 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2155 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2156 warnstring = "declaration of `%s' shadows global declaration";
2159 warning (warnstring, IDENTIFIER_POINTER (name));
2162 /* If storing a local value, there may already be one (inherited).
2163 If so, record it for restoration when this binding level ends. */
2165 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2168 /* Keep count of variables in this level with incomplete type. */
2169 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2173 /* Put decls on list in reverse order.
2174 We will reverse them later if necessary. */
2175 TREE_CHAIN (x) = b->names;
2181 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2184 pushdecl_top_level (x)
2188 register struct binding_level *b = current_binding_level;
2190 current_binding_level = global_binding_level;
2192 current_binding_level = b;
2196 /* Generate an implicit declaration for identifier FUNCTIONID
2197 as a function of type int (). Print a warning if appropriate. */
2200 implicitly_declare (functionid)
2204 int traditional_warning = 0;
2205 /* Only one "implicit declaration" warning per identifier. */
2206 int implicit_warning;
2208 /* Save the decl permanently so we can warn if definition follows. */
2209 push_obstacks_nochange ();
2210 end_temporary_allocation ();
2212 /* We used to reuse an old implicit decl here,
2213 but this loses with inline functions because it can clobber
2214 the saved decl chains. */
2215 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2216 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2218 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2220 /* Warn of implicit decl following explicit local extern decl.
2221 This is probably a program designed for traditional C. */
2222 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2223 traditional_warning = 1;
2225 /* Warn once of an implicit declaration. */
2226 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2228 DECL_EXTERNAL (decl) = 1;
2229 TREE_PUBLIC (decl) = 1;
2231 /* Record that we have an implicit decl and this is it. */
2232 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2234 /* ANSI standard says implicit declarations are in the innermost block.
2235 So we record the decl in the standard fashion.
2236 If flag_traditional is set, pushdecl does it top-level. */
2239 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2240 maybe_objc_check_decl (decl);
2242 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2244 if (warn_implicit && implicit_warning)
2245 warning ("implicit declaration of function `%s'",
2246 IDENTIFIER_POINTER (functionid));
2247 else if (warn_traditional && traditional_warning)
2248 warning ("function `%s' was previously declared within a block",
2249 IDENTIFIER_POINTER (functionid));
2251 /* Write a record describing this implicit function declaration to the
2252 prototypes file (if requested). */
2254 gen_aux_info_record (decl, 0, 1, 0);
2261 /* Return zero if the declaration NEWDECL is valid
2262 when the declaration OLDDECL (assumed to be for the same name)
2263 has already been seen.
2264 Otherwise return an error message format string with a %s
2265 where the identifier should go. */
2268 redeclaration_error_message (newdecl, olddecl)
2269 tree newdecl, olddecl;
2271 if (TREE_CODE (newdecl) == TYPE_DECL)
2273 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2275 return "redefinition of `%s'";
2277 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2279 /* Declarations of functions can insist on internal linkage
2280 but they can't be inconsistent with internal linkage,
2281 so there can be no error on that account.
2282 However defining the same name twice is no good. */
2283 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2284 /* However, defining once as extern inline and a second
2285 time in another way is ok. */
2286 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2287 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2288 return "redefinition of `%s'";
2291 else if (current_binding_level == global_binding_level)
2293 /* Objects declared at top level: */
2294 /* If at least one is a reference, it's ok. */
2295 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2297 /* Reject two definitions. */
2298 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2299 return "redefinition of `%s'";
2300 /* Now we have two tentative defs, or one tentative and one real def. */
2301 /* Insist that the linkage match. */
2302 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2303 return "conflicting declarations of `%s'";
2306 else if (current_binding_level->parm_flag
2307 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2311 /* Objects declared with block scope: */
2312 /* Reject two definitions, and reject a definition
2313 together with an external reference. */
2314 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2315 return "redeclaration of `%s'";
2320 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2321 Create one if none exists so far for the current function.
2322 This function is called for both label definitions and label references. */
2328 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2330 if (current_function_decl == 0)
2332 error ("label %s referenced outside of any function",
2333 IDENTIFIER_POINTER (id));
2337 /* Use a label already defined or ref'd with this name. */
2340 /* But not if it is inherited and wasn't declared to be inheritable. */
2341 if (DECL_CONTEXT (decl) != current_function_decl
2342 && ! C_DECLARED_LABEL_FLAG (decl))
2343 return shadow_label (id);
2347 decl = build_decl (LABEL_DECL, id, void_type_node);
2349 /* Make sure every label has an rtx. */
2352 /* A label not explicitly declared must be local to where it's ref'd. */
2353 DECL_CONTEXT (decl) = current_function_decl;
2355 DECL_MODE (decl) = VOIDmode;
2357 /* Say where one reference is to the label,
2358 for the sake of the error if it is not defined. */
2359 DECL_SOURCE_LINE (decl) = lineno;
2360 DECL_SOURCE_FILE (decl) = input_filename;
2362 IDENTIFIER_LABEL_VALUE (id) = decl;
2364 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2369 /* Make a label named NAME in the current function,
2370 shadowing silently any that may be inherited from containing functions
2371 or containing scopes.
2373 Note that valid use, if the label being shadowed
2374 comes from another scope in the same function,
2375 requires calling declare_nonlocal_label right away. */
2381 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2385 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2386 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2389 return lookup_label (name);
2392 /* Define a label, specifying the location in the source file.
2393 Return the LABEL_DECL node for the label, if the definition is valid.
2394 Otherwise return 0. */
2397 define_label (filename, line, name)
2402 tree decl = lookup_label (name);
2404 /* If label with this name is known from an outer context, shadow it. */
2405 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2407 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2408 IDENTIFIER_LABEL_VALUE (name) = 0;
2409 decl = lookup_label (name);
2412 if (DECL_INITIAL (decl) != 0)
2414 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2419 /* Mark label as having been defined. */
2420 DECL_INITIAL (decl) = error_mark_node;
2421 /* Say where in the source. */
2422 DECL_SOURCE_FILE (decl) = filename;
2423 DECL_SOURCE_LINE (decl) = line;
2428 /* Return the list of declarations of the current level.
2429 Note that this list is in reverse order unless/until
2430 you nreverse it; and when you do nreverse it, you must
2431 store the result back using `storedecls' or you will lose. */
2436 return current_binding_level->names;
2439 /* Return the list of type-tags (for structs, etc) of the current level. */
2444 return current_binding_level->tags;
2447 /* Store the list of declarations of the current level.
2448 This is done for the parameter declarations of a function being defined,
2449 after they are modified in the light of any missing parameters. */
2455 current_binding_level->names = decls;
2458 /* Similarly, store the list of tags of the current level. */
2464 current_binding_level->tags = tags;
2467 /* Given NAME, an IDENTIFIER_NODE,
2468 return the structure (or union or enum) definition for that name.
2469 Searches binding levels from BINDING_LEVEL up to the global level.
2470 If THISLEVEL_ONLY is nonzero, searches only the specified context
2471 (but skips any tag-transparent contexts to find one that is
2472 meaningful for tags).
2473 CODE says which kind of type the caller wants;
2474 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2475 If the wrong kind of type is found, an error is reported. */
2478 lookup_tag (code, name, binding_level, thislevel_only)
2479 enum tree_code code;
2480 struct binding_level *binding_level;
2484 register struct binding_level *level;
2486 for (level = binding_level; level; level = level->level_chain)
2489 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2491 if (TREE_PURPOSE (tail) == name)
2493 if (TREE_CODE (TREE_VALUE (tail)) != code)
2495 /* Definition isn't the kind we were looking for. */
2496 pending_invalid_xref = name;
2497 pending_invalid_xref_file = input_filename;
2498 pending_invalid_xref_line = lineno;
2500 return TREE_VALUE (tail);
2503 if (thislevel_only && ! level->tag_transparent)
2509 /* Print an error message now
2510 for a recent invalid struct, union or enum cross reference.
2511 We don't print them immediately because they are not invalid
2512 when used in the `struct foo;' construct for shadowing. */
2515 pending_xref_error ()
2517 if (pending_invalid_xref != 0)
2518 error_with_file_and_line (pending_invalid_xref_file,
2519 pending_invalid_xref_line,
2520 "`%s' defined as wrong kind of tag",
2521 IDENTIFIER_POINTER (pending_invalid_xref));
2522 pending_invalid_xref = 0;
2525 /* Given a type, find the tag that was defined for it and return the tag name.
2526 Otherwise return 0. */
2529 lookup_tag_reverse (type)
2532 register struct binding_level *level;
2534 for (level = current_binding_level; level; level = level->level_chain)
2537 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2539 if (TREE_VALUE (tail) == type)
2540 return TREE_PURPOSE (tail);
2546 /* Look up NAME in the current binding level and its superiors
2547 in the namespace of variables, functions and typedefs.
2548 Return a ..._DECL node of some kind representing its definition,
2549 or return 0 if it is undefined. */
2556 if (current_binding_level != global_binding_level
2557 && IDENTIFIER_LOCAL_VALUE (name))
2558 val = IDENTIFIER_LOCAL_VALUE (name);
2560 val = IDENTIFIER_GLOBAL_VALUE (name);
2564 /* Similar to `lookup_name' but look only at current binding level. */
2567 lookup_name_current_level (name)
2572 if (current_binding_level == global_binding_level)
2573 return IDENTIFIER_GLOBAL_VALUE (name);
2575 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2578 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2579 if (DECL_NAME (t) == name)
2585 /* Create the predefined scalar types of C,
2586 and some nodes representing standard constants (0, 1, (void *)0).
2587 Initialize the global binding level.
2588 Make definitions for built-in primitive functions. */
2591 init_decl_processing ()
2593 register tree endlink;
2594 /* Either char* or void*. */
2595 tree traditional_ptr_type_node;
2596 /* Data types of memcpy and strlen. */
2597 tree memcpy_ftype, strlen_ftype;
2598 tree void_ftype_any;
2599 int wchar_type_size;
2601 tree array_domain_type;
2603 current_function_decl = NULL;
2604 named_labels = NULL;
2605 current_binding_level = NULL_BINDING_LEVEL;
2606 free_binding_level = NULL_BINDING_LEVEL;
2607 pushlevel (0); /* make the binding_level structure for global names */
2608 global_binding_level = current_binding_level;
2610 /* Define `int' and `char' first so that dbx will output them first. */
2612 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2613 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2614 integer_type_node));
2616 /* Define `char', which is like either `signed char' or `unsigned char'
2617 but not the same as either. */
2621 ? make_signed_type (CHAR_TYPE_SIZE)
2622 : make_unsigned_type (CHAR_TYPE_SIZE));
2623 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2626 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2627 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2628 long_integer_type_node));
2630 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2631 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2632 unsigned_type_node));
2634 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2635 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2636 long_unsigned_type_node));
2638 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2639 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2640 long_long_integer_type_node));
2642 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2643 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2644 long_long_unsigned_type_node));
2646 /* `unsigned long' is the standard type for sizeof.
2647 Traditionally, use a signed type.
2648 Note that stddef.h uses `unsigned long',
2649 and this must agree, even of long and int are the same size. */
2651 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2652 if (flag_traditional && TREE_UNSIGNED (sizetype))
2653 sizetype = signed_type (sizetype);
2656 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2658 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2659 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2660 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2661 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2662 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2663 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node)) = sizetype;
2664 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node)) = sizetype;
2666 error_mark_node = make_node (ERROR_MARK);
2667 TREE_TYPE (error_mark_node) = error_mark_node;
2669 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2670 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2671 short_integer_type_node));
2673 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2674 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2675 short_unsigned_type_node));
2677 /* Define both `signed char' and `unsigned char'. */
2678 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2679 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2680 signed_char_type_node));
2682 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2683 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2684 unsigned_char_type_node));
2686 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2687 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2689 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2690 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2692 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2693 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2695 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2696 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2698 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2699 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2701 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2702 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2704 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2705 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2707 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2708 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2710 float_type_node = make_node (REAL_TYPE);
2711 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2712 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2714 layout_type (float_type_node);
2716 double_type_node = make_node (REAL_TYPE);
2717 if (flag_short_double)
2718 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2720 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2721 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2723 layout_type (double_type_node);
2725 long_double_type_node = make_node (REAL_TYPE);
2726 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2727 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2728 long_double_type_node));
2729 layout_type (long_double_type_node);
2731 complex_integer_type_node = make_node (COMPLEX_TYPE);
2732 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2733 complex_integer_type_node));
2734 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2735 layout_type (complex_integer_type_node);
2737 complex_float_type_node = make_node (COMPLEX_TYPE);
2738 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2739 complex_float_type_node));
2740 TREE_TYPE (complex_float_type_node) = float_type_node;
2741 layout_type (complex_float_type_node);
2743 complex_double_type_node = make_node (COMPLEX_TYPE);
2744 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2745 complex_double_type_node));
2746 TREE_TYPE (complex_double_type_node) = double_type_node;
2747 layout_type (complex_double_type_node);
2749 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2750 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2751 complex_long_double_type_node));
2752 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2753 layout_type (complex_long_double_type_node);
2756 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2757 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2758 signed_wchar_type_node = signed_type (wchar_type_node);
2759 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
2761 integer_zero_node = build_int_2 (0, 0);
2762 TREE_TYPE (integer_zero_node) = integer_type_node;
2763 integer_one_node = build_int_2 (1, 0);
2764 TREE_TYPE (integer_one_node) = integer_type_node;
2766 size_zero_node = build_int_2 (0, 0);
2767 TREE_TYPE (size_zero_node) = sizetype;
2768 size_one_node = build_int_2 (1, 0);
2769 TREE_TYPE (size_one_node) = sizetype;
2771 void_type_node = make_node (VOID_TYPE);
2772 pushdecl (build_decl (TYPE_DECL,
2773 ridpointers[(int) RID_VOID], void_type_node));
2774 layout_type (void_type_node); /* Uses integer_zero_node */
2775 /* We are not going to have real types in C with less than byte alignment,
2776 so we might as well not have any types that claim to have it. */
2777 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2779 null_pointer_node = build_int_2 (0, 0);
2780 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2781 layout_type (TREE_TYPE (null_pointer_node));
2783 string_type_node = build_pointer_type (char_type_node);
2784 const_string_type_node
2785 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2787 /* Make a type to be the domain of a few array types
2788 whose domains don't really matter.
2789 200 is small enough that it always fits in size_t
2790 and large enough that it can hold most function names for the
2791 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
2792 array_domain_type = build_index_type (build_int_2 (200, 0));
2794 /* make a type for arrays of characters.
2795 With luck nothing will ever really depend on the length of this
2797 char_array_type_node
2798 = build_array_type (char_type_node, array_domain_type);
2799 /* Likewise for arrays of ints. */
2801 = build_array_type (integer_type_node, array_domain_type);
2802 /* This is for wide string constants. */
2803 wchar_array_type_node
2804 = build_array_type (wchar_type_node, array_domain_type);
2806 default_function_type
2807 = build_function_type (integer_type_node, NULL_TREE);
2809 ptr_type_node = build_pointer_type (void_type_node);
2811 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2813 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2816 = build_function_type (void_type_node, NULL_TREE);
2819 = build_function_type (double_type_node,
2820 tree_cons (NULL_TREE, double_type_node, endlink));
2822 double_ftype_double_double
2823 = build_function_type (double_type_node,
2824 tree_cons (NULL_TREE, double_type_node,
2825 tree_cons (NULL_TREE,
2826 double_type_node, endlink)));
2829 = build_function_type (integer_type_node,
2830 tree_cons (NULL_TREE, integer_type_node, endlink));
2833 = build_function_type (long_integer_type_node,
2834 tree_cons (NULL_TREE,
2835 long_integer_type_node, endlink));
2837 void_ftype_ptr_ptr_int
2838 = build_function_type (void_type_node,
2839 tree_cons (NULL_TREE, ptr_type_node,
2840 tree_cons (NULL_TREE, ptr_type_node,
2841 tree_cons (NULL_TREE,
2845 int_ftype_cptr_cptr_sizet
2846 = build_function_type (integer_type_node,
2847 tree_cons (NULL_TREE, const_ptr_type_node,
2848 tree_cons (NULL_TREE, const_ptr_type_node,
2849 tree_cons (NULL_TREE,
2853 void_ftype_ptr_int_int
2854 = build_function_type (void_type_node,
2855 tree_cons (NULL_TREE, ptr_type_node,
2856 tree_cons (NULL_TREE, integer_type_node,
2857 tree_cons (NULL_TREE,
2861 string_ftype_ptr_ptr /* strcpy prototype */
2862 = build_function_type (string_type_node,
2863 tree_cons (NULL_TREE, string_type_node,
2864 tree_cons (NULL_TREE,
2865 const_string_type_node,
2868 int_ftype_string_string /* strcmp prototype */
2869 = build_function_type (integer_type_node,
2870 tree_cons (NULL_TREE, const_string_type_node,
2871 tree_cons (NULL_TREE,
2872 const_string_type_node,
2875 strlen_ftype /* strlen prototype */
2876 = build_function_type (flag_traditional ? integer_type_node : sizetype,
2877 tree_cons (NULL_TREE, const_string_type_node,
2880 traditional_ptr_type_node
2881 = (flag_traditional ? string_type_node : ptr_type_node);
2883 memcpy_ftype /* memcpy prototype */
2884 = build_function_type (traditional_ptr_type_node,
2885 tree_cons (NULL_TREE, ptr_type_node,
2886 tree_cons (NULL_TREE, const_ptr_type_node,
2887 tree_cons (NULL_TREE,
2891 builtin_function ("__builtin_constant_p", int_ftype_int,
2892 BUILT_IN_CONSTANT_P, NULL_PTR);
2894 builtin_function ("__builtin_return_address",
2895 build_function_type (ptr_type_node,
2896 tree_cons (NULL_TREE,
2899 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
2901 builtin_function ("__builtin_frame_address",
2902 build_function_type (ptr_type_node,
2903 tree_cons (NULL_TREE,
2906 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
2908 builtin_function ("__builtin_alloca",
2909 build_function_type (ptr_type_node,
2910 tree_cons (NULL_TREE,
2913 BUILT_IN_ALLOCA, "alloca");
2914 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2915 /* Define alloca, ffs as builtins.
2916 Declare _exit just to mark it as volatile. */
2917 if (! flag_no_builtin && !flag_no_nonansi_builtin)
2919 temp = builtin_function ("alloca",
2920 build_function_type (ptr_type_node,
2921 tree_cons (NULL_TREE,
2924 BUILT_IN_ALLOCA, NULL_PTR);
2925 /* Suppress error if redefined as a non-function. */
2926 DECL_BUILT_IN_NONANSI (temp) = 1;
2927 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2928 /* Suppress error if redefined as a non-function. */
2929 DECL_BUILT_IN_NONANSI (temp) = 1;
2930 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
2932 TREE_THIS_VOLATILE (temp) = 1;
2933 TREE_SIDE_EFFECTS (temp) = 1;
2934 /* Suppress error if redefined as a non-function. */
2935 DECL_BUILT_IN_NONANSI (temp) = 1;
2938 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2939 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
2941 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
2943 builtin_function ("__builtin_saveregs",
2944 build_function_type (ptr_type_node, NULL_TREE),
2945 BUILT_IN_SAVEREGS, NULL_PTR);
2946 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2948 builtin_function ("__builtin_varargs",
2949 build_function_type (ptr_type_node,
2950 tree_cons (NULL_TREE,
2953 BUILT_IN_VARARGS, NULL_PTR);
2955 builtin_function ("__builtin_classify_type", default_function_type,
2956 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
2957 builtin_function ("__builtin_next_arg",
2958 build_function_type (ptr_type_node, endlink),
2959 BUILT_IN_NEXT_ARG, NULL_PTR);
2960 builtin_function ("__builtin_args_info",
2961 build_function_type (integer_type_node,
2962 tree_cons (NULL_TREE,
2965 BUILT_IN_ARGS_INFO, NULL_PTR);
2967 /* Untyped call and return. */
2968 builtin_function ("__builtin_apply_args",
2969 build_function_type (ptr_type_node, NULL_TREE),
2970 BUILT_IN_APPLY_ARGS, NULL_PTR);
2972 temp = tree_cons (NULL_TREE,
2973 build_pointer_type (build_function_type (void_type_node,
2975 tree_cons (NULL_TREE,
2977 tree_cons (NULL_TREE,
2980 builtin_function ("__builtin_apply",
2981 build_function_type (ptr_type_node, temp),
2982 BUILT_IN_APPLY, NULL_PTR);
2983 builtin_function ("__builtin_return",
2984 build_function_type (void_type_node,
2985 tree_cons (NULL_TREE,
2988 BUILT_IN_RETURN, NULL_PTR);
2990 /* Currently under experimentation. */
2991 builtin_function ("__builtin_memcpy", memcpy_ftype,
2992 BUILT_IN_MEMCPY, "memcpy");
2993 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
2994 BUILT_IN_MEMCMP, "memcmp");
2995 builtin_function ("__builtin_strcmp", int_ftype_string_string,
2996 BUILT_IN_STRCMP, "strcmp");
2997 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
2998 BUILT_IN_STRCPY, "strcpy");
2999 builtin_function ("__builtin_strlen", strlen_ftype,
3000 BUILT_IN_STRLEN, "strlen");
3001 builtin_function ("__builtin_fsqrt", double_ftype_double,
3002 BUILT_IN_FSQRT, "sqrt");
3003 builtin_function ("__builtin_sin", double_ftype_double,
3004 BUILT_IN_SIN, "sin");
3005 builtin_function ("__builtin_cos", double_ftype_double,
3006 BUILT_IN_COS, "cos");
3008 /* In an ANSI C program, it is okay to supply built-in meanings
3009 for these functions, since applications cannot validly use them
3010 with any other meaning.
3011 However, honor the -fno-builtin option. */
3012 if (!flag_no_builtin)
3014 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3015 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3016 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3017 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3018 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3020 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3022 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3024 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3025 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3026 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3027 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3029 /* Declare these functions volatile
3030 to avoid spurious "control drops through" warnings. */
3031 /* Don't specify the argument types, to avoid errors
3032 from certain code which isn't valid in ANSI but which exists. */
3033 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3035 TREE_THIS_VOLATILE (temp) = 1;
3036 TREE_SIDE_EFFECTS (temp) = 1;
3037 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3038 TREE_THIS_VOLATILE (temp) = 1;
3039 TREE_SIDE_EFFECTS (temp) = 1;
3043 /* Support for these has not been written in either expand_builtin
3044 or build_function_call. */
3045 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3046 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3047 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3049 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3051 builtin_function ("__builtin_fmod", double_ftype_double_double,
3052 BUILT_IN_FMOD, NULL_PTR);
3053 builtin_function ("__builtin_frem", double_ftype_double_double,
3054 BUILT_IN_FREM, NULL_PTR);
3055 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3056 BUILT_IN_MEMSET, NULL_PTR);
3057 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3059 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3063 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3064 declare_function_name ();
3066 start_identifier_warnings ();
3068 /* Prepare to check format strings against argument lists. */
3069 init_function_format_info ();
3073 incomplete_decl_finalize_hook = finish_incomplete_decl;
3076 /* Return a definition for a builtin function named NAME and whose data type
3077 is TYPE. TYPE should be a function type with argument types.
3078 FUNCTION_CODE tells later passes how to compile calls to this function.
3079 See tree.h for its possible values.
3081 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3082 the name to be called if we can't opencode the function. */
3085 builtin_function (name, type, function_code, library_name)
3088 enum built_in_function function_code;
3091 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3092 DECL_EXTERNAL (decl) = 1;
3093 TREE_PUBLIC (decl) = 1;
3094 /* If -traditional, permit redefining a builtin function any way you like.
3095 (Though really, if the program redefines these functions,
3096 it probably won't work right unless compiled with -fno-builtin.) */
3097 if (flag_traditional && name[0] != '_')
3098 DECL_BUILT_IN_NONANSI (decl) = 1;
3100 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3101 make_decl_rtl (decl, NULL_PTR, 1);
3103 if (function_code != NOT_BUILT_IN)
3105 DECL_BUILT_IN (decl) = 1;
3106 DECL_SET_FUNCTION_CODE (decl, function_code);
3108 /* Warn if a function in the namespace for users
3109 is used without an occasion to consider it declared. */
3110 if (name[0] != '_' || name[1] != '_')
3111 C_DECL_ANTICIPATED (decl) = 1;
3116 /* Called when a declaration is seen that contains no names to declare.
3117 If its type is a reference to a structure, union or enum inherited
3118 from a containing scope, shadow that tag name for the current scope
3119 with a forward reference.
3120 If its type defines a new named structure or union
3121 or defines an enum, it is valid but we need not do anything here.
3122 Otherwise, it is an error. */
3125 shadow_tag (declspecs)
3128 shadow_tag_warned (declspecs, 0);
3132 shadow_tag_warned (declspecs, warned)
3135 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3141 pending_invalid_xref = 0;
3143 for (link = declspecs; link; link = TREE_CHAIN (link))
3145 register tree value = TREE_VALUE (link);
3146 register enum tree_code code = TREE_CODE (value);
3148 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3149 /* Used to test also that TYPE_SIZE (value) != 0.
3150 That caused warning for `struct foo;' at top level in the file. */
3152 register tree name = lookup_tag_reverse (value);
3159 if (warned != 1 && code != ENUMERAL_TYPE)
3160 /* Empty unnamed enum OK */
3162 pedwarn ("unnamed struct/union that defines no instances");
3168 t = lookup_tag (code, name, current_binding_level, 1);
3172 t = make_node (code);
3181 warning ("useless keyword or type name in empty declaration");
3188 error ("two types specified in one empty declaration");
3193 pedwarn ("empty declaration");
3197 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3200 groktypename (typename)
3203 if (TREE_CODE (typename) != TREE_LIST)
3205 return grokdeclarator (TREE_VALUE (typename),
3206 TREE_PURPOSE (typename),
3210 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3213 groktypename_in_parm_context (typename)
3216 if (TREE_CODE (typename) != TREE_LIST)
3218 return grokdeclarator (TREE_VALUE (typename),
3219 TREE_PURPOSE (typename),
3223 /* Decode a declarator in an ordinary declaration or data definition.
3224 This is called as soon as the type information and variable name
3225 have been parsed, before parsing the initializer if any.
3226 Here we create the ..._DECL node, fill in its type,
3227 and put it on the list of decls for the current context.
3228 The ..._DECL node is returned as the value.
3230 Exception: for arrays where the length is not specified,
3231 the type is left null, to be filled in by `finish_decl'.
3233 Function definitions do not come here; they go to start_function
3234 instead. However, external and forward declarations of functions
3235 do go through here. Structure field declarations are done by
3236 grokfield and not through here. */
3238 /* Set this to zero to debug not using the temporary obstack
3239 to parse initializers. */
3240 int debug_temp_inits = 1;
3243 start_decl (declarator, declspecs, initialized)
3244 tree declarator, declspecs;
3247 register tree decl = grokdeclarator (declarator, declspecs,
3248 NORMAL, initialized);
3250 int init_written = initialized;
3252 /* The corresponding pop_obstacks is in finish_decl. */
3253 push_obstacks_nochange ();
3256 /* Is it valid for this decl to have an initializer at all?
3257 If not, set INITIALIZED to zero, which will indirectly
3258 tell `finish_decl' to ignore the initializer once it is parsed. */
3259 switch (TREE_CODE (decl))
3262 /* typedef foo = bar means give foo the same type as bar.
3263 We haven't parsed bar yet, so `finish_decl' will fix that up.
3264 Any other case of an initialization in a TYPE_DECL is an error. */
3265 if (pedantic || list_length (declspecs) > 1)
3267 error ("typedef `%s' is initialized",
3268 IDENTIFIER_POINTER (DECL_NAME (decl)));
3274 error ("function `%s' is initialized like a variable",
3275 IDENTIFIER_POINTER (DECL_NAME (decl)));
3280 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3281 error ("parameter `%s' is initialized",
3282 IDENTIFIER_POINTER (DECL_NAME (decl)));
3287 /* Don't allow initializations for incomplete types
3288 except for arrays which might be completed by the initialization. */
3289 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3291 /* A complete type is ok if size is fixed. */
3293 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3294 || C_DECL_VARIABLE_SIZE (decl))
3296 error ("variable-sized object may not be initialized");
3300 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3302 error ("variable `%s' has initializer but incomplete type",
3303 IDENTIFIER_POINTER (DECL_NAME (decl)));
3306 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3308 error ("elements of array `%s' have incomplete type",
3309 IDENTIFIER_POINTER (DECL_NAME (decl)));
3316 #if 0 /* Seems redundant with grokdeclarator. */
3317 if (current_binding_level != global_binding_level
3318 && DECL_EXTERNAL (decl)
3319 && TREE_CODE (decl) != FUNCTION_DECL)
3320 warning ("declaration of `%s' has `extern' and is initialized",
3321 IDENTIFIER_POINTER (DECL_NAME (decl)));
3323 DECL_EXTERNAL (decl) = 0;
3324 if (current_binding_level == global_binding_level)
3325 TREE_STATIC (decl) = 1;
3327 /* Tell `pushdecl' this is an initialized decl
3328 even though we don't yet have the initializer expression.
3329 Also tell `finish_decl' it may store the real initializer. */
3330 DECL_INITIAL (decl) = error_mark_node;
3333 /* If this is a function declaration, write a record describing it to the
3334 prototypes file (if requested). */
3336 if (TREE_CODE (decl) == FUNCTION_DECL)
3337 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3339 /* Add this decl to the current binding level.
3340 TEM may equal DECL or it may be a previous decl of the same name. */
3341 tem = pushdecl (decl);
3343 /* For C and Obective-C, we by default put things in .common when
3345 DECL_COMMON (tem) = 1;
3347 /* For a local variable, define the RTL now. */
3348 if (current_binding_level != global_binding_level
3349 /* But not if this is a duplicate decl
3350 and we preserved the rtl from the previous one
3351 (which may or may not happen). */
3352 && DECL_RTL (tem) == 0)
3354 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3356 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3357 && DECL_INITIAL (tem) != 0)
3363 /* When parsing and digesting the initializer,
3364 use temporary storage. Do this even if we will ignore the value. */
3365 if (current_binding_level == global_binding_level && debug_temp_inits)
3366 temporary_allocation ();
3372 /* Finish processing of a declaration;
3373 install its initial value.
3374 If the length of an array type is not known before,
3375 it must be determined now, from the initial value, or it is an error. */
3378 finish_decl (decl, init, asmspec_tree)
3382 register tree type = TREE_TYPE (decl);
3383 int was_incomplete = (DECL_SIZE (decl) == 0);
3384 int temporary = allocation_temporary_p ();
3388 asmspec = TREE_STRING_POINTER (asmspec_tree);
3390 /* If `start_decl' didn't like having an initialization, ignore it now. */
3392 if (init != 0 && DECL_INITIAL (decl) == 0)
3394 /* Don't crash if parm is initialized. */
3395 if (TREE_CODE (decl) == PARM_DECL)
3398 if (ITERATOR_P (decl))
3401 error_with_decl (decl, "iterator has no initial value");
3403 init = save_expr (init);
3408 if (TREE_CODE (decl) != TYPE_DECL)
3409 store_init_value (decl, init);
3412 /* typedef foo = bar; store the type of bar as the type of foo. */
3413 TREE_TYPE (decl) = TREE_TYPE (init);
3414 DECL_INITIAL (decl) = init = 0;
3418 /* Pop back to the obstack that is current for this binding level.
3419 This is because MAXINDEX, rtl, etc. to be made below
3420 must go in the permanent obstack. But don't discard the
3421 temporary data yet. */
3423 #if 0 /* pop_obstacks was near the end; this is what was here. */
3424 if (current_binding_level == global_binding_level && temporary)
3425 end_temporary_allocation ();
3428 /* Deduce size of array from initialization, if not already known */
3430 if (TREE_CODE (type) == ARRAY_TYPE
3431 && TYPE_DOMAIN (type) == 0
3432 && TREE_CODE (decl) != TYPE_DECL)
3435 = (TREE_STATIC (decl)
3436 /* Even if pedantic, an external linkage array
3437 may have incomplete type at first. */
3438 ? pedantic && !TREE_PUBLIC (decl)
3439 : !DECL_EXTERNAL (decl));
3441 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3443 /* Get the completed type made by complete_array_type. */
3444 type = TREE_TYPE (decl);
3447 error_with_decl (decl, "initializer fails to determine size of `%s'");
3452 error_with_decl (decl, "array size missing in `%s'");
3453 /* If a `static' var's size isn't known,
3454 make it extern as well as static, so it does not get
3456 If it is not `static', then do not mark extern;
3457 finish_incomplete_decl will give it a default size
3458 and it will get allocated. */
3459 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3460 DECL_EXTERNAL (decl) = 1;
3463 if (pedantic && TYPE_DOMAIN (type) != 0
3464 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3466 error_with_decl (decl, "zero-size array `%s'");
3468 layout_decl (decl, 0);
3471 if (TREE_CODE (decl) == VAR_DECL)
3473 if (DECL_SIZE (decl) == 0
3474 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3475 layout_decl (decl, 0);
3477 if (DECL_SIZE (decl) == 0
3478 && (TREE_STATIC (decl)
3480 /* A static variable with an incomplete type
3481 is an error if it is initialized.
3482 Also if it is not file scope.
3483 Otherwise, let it through, but if it is not `extern'
3484 then it may cause an error message later. */
3485 (DECL_INITIAL (decl) != 0
3486 || current_binding_level != global_binding_level)
3488 /* An automatic variable with an incomplete type
3490 !DECL_EXTERNAL (decl)))
3492 error_with_decl (decl, "storage size of `%s' isn't known");
3493 TREE_TYPE (decl) = error_mark_node;
3496 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3497 && DECL_SIZE (decl) != 0)
3499 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3500 constant_expression_warning (DECL_SIZE (decl));
3502 error_with_decl (decl, "storage size of `%s' isn't constant");
3506 /* Output the assembler code and/or RTL code for variables and functions,
3507 unless the type is an undefined structure or union.
3508 If not, it will get done when the type is completed. */
3510 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3512 if (flag_traditional && allocation_temporary_p ())
3514 push_obstacks_nochange ();
3515 end_temporary_allocation ();
3516 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3517 maybe_objc_check_decl (decl);
3518 rest_of_decl_compilation (decl, asmspec,
3519 current_binding_level == global_binding_level,
3525 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3526 maybe_objc_check_decl (decl);
3527 rest_of_decl_compilation (decl, asmspec,
3528 current_binding_level == global_binding_level,
3531 if (current_binding_level != global_binding_level)
3533 /* Recompute the RTL of a local array now
3534 if it used to be an incomplete type. */
3536 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3538 /* If we used it already as memory, it must stay in memory. */
3539 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3540 /* If it's still incomplete now, no init will save it. */
3541 if (DECL_SIZE (decl) == 0)
3542 DECL_INITIAL (decl) = 0;
3545 /* Compute and store the initial value. */
3546 if (TREE_CODE (decl) != FUNCTION_DECL)
3547 expand_decl_init (decl);
3551 if (TREE_CODE (decl) == TYPE_DECL)
3553 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3554 maybe_objc_check_decl (decl);
3555 rest_of_decl_compilation (decl, NULL_PTR,
3556 current_binding_level == global_binding_level,
3560 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3561 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3562 && temporary && TREE_PERMANENT (decl)
3563 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3564 space with DECL_ARG_TYPE. */
3565 && TREE_CODE (decl) != PARM_DECL)
3567 /* We need to remember that this array HAD an initialization,
3568 but discard the actual temporary nodes,
3569 since we can't have a permanent node keep pointing to them. */
3570 /* We make an exception for inline functions, since it's
3571 normal for a local extern redeclaration of an inline function
3572 to have a copy of the top-level decl's DECL_INLINE. */
3573 if (DECL_INITIAL (decl) != 0)
3575 /* If this is a static const variable, then preserve the
3576 initializer instead of discarding it so that we can optimize
3577 references to it. */
3578 if (TREE_STATIC (decl) && TREE_READONLY (decl))
3580 preserve_initializer ();
3581 /* Hack? Set the permanent bit for something that is permanent,
3582 but not on the permenent obstack, so as to convince
3583 output_constant_def to make its rtl on the permanent
3585 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3588 DECL_INITIAL (decl) = error_mark_node;
3593 /* Resume permanent allocation, if not within a function. */
3594 /* The corresponding push_obstacks_nochange is in start_decl,
3595 and in push_parm_decl and in grokfield. */
3599 /* If we have gone back from temporary to permanent allocation,
3600 actually free the temporary space that we no longer need. */
3601 if (temporary && !allocation_temporary_p ())
3602 permanent_allocation ();
3604 /* At the end of a declaration, throw away any variable type sizes
3605 of types defined inside that declaration. There is no use
3606 computing them in the following function definition. */
3607 if (current_binding_level == global_binding_level)
3608 get_pending_sizes ();
3611 /* If DECL has a cleanup, build and return that cleanup here.
3612 This is a callback called by expand_expr. */
3615 maybe_build_cleanup (decl)
3618 /* There are no cleanups in C. */
3622 /* Given a parsed parameter declaration,
3623 decode it into a PARM_DECL and push that on the current binding level.
3624 Also, for the sake of forward parm decls,
3625 record the given order of parms in `parm_order'. */
3628 push_parm_decl (parm)
3632 int old_immediate_size_expand = immediate_size_expand;
3633 /* Don't try computing parm sizes now -- wait till fn is called. */
3634 immediate_size_expand = 0;
3636 /* The corresponding pop_obstacks is in finish_decl. */
3637 push_obstacks_nochange ();
3639 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3642 if (DECL_NAME (decl))
3644 olddecl = lookup_name (DECL_NAME (decl));
3645 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3646 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3650 decl = pushdecl (decl);
3652 immediate_size_expand = old_immediate_size_expand;
3654 current_binding_level->parm_order
3655 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3657 /* Add this decl to the current binding level. */
3658 finish_decl (decl, NULL_TREE, NULL_TREE);
3661 /* Clear the given order of parms in `parm_order'.
3662 Used at start of parm list,
3663 and also at semicolon terminating forward decls. */
3668 current_binding_level->parm_order = NULL_TREE;
3671 /* Make TYPE a complete type based on INITIAL_VALUE.
3672 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3673 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3676 complete_array_type (type, initial_value, do_default)
3681 register tree maxindex = NULL_TREE;
3686 /* Note MAXINDEX is really the maximum index,
3687 one less than the size. */
3688 if (TREE_CODE (initial_value) == STRING_CST)
3691 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3692 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3695 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3697 tree elts = CONSTRUCTOR_ELTS (initial_value);
3698 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3699 for (; elts; elts = TREE_CHAIN (elts))
3701 if (TREE_PURPOSE (elts))
3702 maxindex = TREE_PURPOSE (elts);
3704 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3706 maxindex = copy_node (maxindex);
3710 /* Make an error message unless that happened already. */
3711 if (initial_value != error_mark_node)
3714 /* Prevent further error messages. */
3715 maxindex = build_int_2 (0, 0);
3722 maxindex = build_int_2 (0, 0);
3728 TYPE_DOMAIN (type) = build_index_type (maxindex);
3729 if (!TREE_TYPE (maxindex))
3730 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3731 #if 0 /* I took out this change
3732 together with the change in build_array_type. --rms */
3733 change_main_variant (type,
3734 build_array_type (TREE_TYPE (type),
3735 TYPE_DOMAIN (type)));
3739 /* Lay out the type now that we can get the real answer. */
3746 /* Given declspecs and a declarator,
3747 determine the name and type of the object declared
3748 and construct a ..._DECL node for it.
3749 (In one case we can return a ..._TYPE node instead.
3750 For invalid input we sometimes return 0.)
3752 DECLSPECS is a chain of tree_list nodes whose value fields
3753 are the storage classes and type specifiers.
3755 DECL_CONTEXT says which syntactic context this declaration is in:
3756 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3757 FUNCDEF for a function definition. Like NORMAL but a few different
3758 error messages in each case. Return value may be zero meaning
3759 this definition is too screwy to try to parse.
3760 PARM for a parameter declaration (either within a function prototype
3761 or before a function body). Make a PARM_DECL, or return void_type_node.
3762 TYPENAME if for a typename (in a cast or sizeof).
3763 Don't make a DECL node; just return the ..._TYPE node.
3764 FIELD for a struct or union field; make a FIELD_DECL.
3765 BITFIELD for a field with specified width.
3766 INITIALIZED is 1 if the decl has an initializer.
3768 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3769 It may also be so in the PARM case, for a prototype where the
3770 argument type is specified but not the name.
3772 This function is where the complicated C meanings of `static'
3773 and `extern' are interpreted. */
3776 grokdeclarator (declarator, declspecs, decl_context, initialized)
3779 enum decl_context decl_context;
3784 tree type = NULL_TREE;
3789 int explicit_int = 0;
3790 int explicit_char = 0;
3791 int defaulted_int = 0;
3792 tree typedef_decl = 0;
3794 tree typedef_type = 0;
3795 int funcdef_flag = 0;
3796 enum tree_code innermost_code = ERROR_MARK;
3798 int size_varies = 0;
3800 if (decl_context == BITFIELD)
3801 bitfield = 1, decl_context = FIELD;
3803 if (decl_context == FUNCDEF)
3804 funcdef_flag = 1, decl_context = NORMAL;
3806 push_obstacks_nochange ();
3808 if (flag_traditional && allocation_temporary_p ())
3809 end_temporary_allocation ();
3811 /* Look inside a declarator for the name being declared
3812 and get it as a string, for an error message. */
3814 register tree decl = declarator;
3818 switch (TREE_CODE (decl))
3823 innermost_code = TREE_CODE (decl);
3824 decl = TREE_OPERAND (decl, 0);
3827 case IDENTIFIER_NODE:
3828 name = IDENTIFIER_POINTER (decl);
3839 /* A function definition's declarator must have the form of
3840 a function declarator. */
3842 if (funcdef_flag && innermost_code != CALL_EXPR)
3845 /* Anything declared one level down from the top level
3846 must be one of the parameters of a function
3847 (because the body is at least two levels down). */
3849 /* If this looks like a function definition, make it one,
3850 even if it occurs where parms are expected.
3851 Then store_parm_decls will reject it and not use it as a parm. */
3852 if (decl_context == NORMAL && !funcdef_flag
3853 && current_binding_level->level_chain == global_binding_level)
3854 decl_context = PARM;
3856 /* Look through the decl specs and record which ones appear.
3857 Some typespecs are defined as built-in typenames.
3858 Others, the ones that are modifiers of other types,
3859 are represented by bits in SPECBITS: set the bits for
3860 the modifiers that appear. Storage class keywords are also in SPECBITS.
3862 If there is a typedef name or a type, store the type in TYPE.
3863 This includes builtin typedefs such as `int'.
3865 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3866 and did not come from a user typedef.
3868 Set LONGLONG if `long' is mentioned twice. */
3870 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3873 register tree id = TREE_VALUE (spec);
3875 if (id == ridpointers[(int) RID_INT])
3877 if (id == ridpointers[(int) RID_CHAR])
3880 if (TREE_CODE (id) == IDENTIFIER_NODE)
3881 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3883 if (ridpointers[i] == id)
3885 if (i == (int) RID_LONG && specbits & (1<<i))
3888 error ("`long long long' is too long for GCC");
3892 pedwarn ("ANSI C does not support `long long'");
3896 else if (specbits & (1 << i))
3897 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3903 error ("two or more data types in declaration of `%s'", name);
3904 /* Actual typedefs come to us as TYPE_DECL nodes. */
3905 else if (TREE_CODE (id) == TYPE_DECL)
3907 type = TREE_TYPE (id);
3910 /* Built-in types come as identifiers. */
3911 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3913 register tree t = lookup_name (id);
3914 if (TREE_TYPE (t) == error_mark_node)
3916 else if (!t || TREE_CODE (t) != TYPE_DECL)
3917 error ("`%s' fails to be a typedef or built in type",
3918 IDENTIFIER_POINTER (id));
3921 type = TREE_TYPE (t);
3925 else if (TREE_CODE (id) != ERROR_MARK)
3931 typedef_type = type;
3933 size_varies = C_TYPE_VARIABLE_SIZE (type);
3935 /* No type at all: default to `int', and set DEFAULTED_INT
3936 because it was not a user-defined typedef. */
3940 if (funcdef_flag && warn_return_type
3941 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3942 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3943 warn_about_return_type = 1;
3945 type = integer_type_node;
3948 /* Now process the modifiers that were specified
3949 and check for invalid combinations. */
3951 /* Long double is a special combination. */
3953 if ((specbits & 1 << (int) RID_LONG)
3954 && TYPE_MAIN_VARIANT (type) == double_type_node)
3956 specbits &= ~ (1 << (int) RID_LONG);
3957 type = long_double_type_node;
3960 /* Check all other uses of type modifiers. */
3962 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3963 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3967 if (TREE_CODE (type) != INTEGER_TYPE)
3968 error ("long, short, signed or unsigned invalid for `%s'", name);
3969 else if ((specbits & 1 << (int) RID_LONG)
3970 && (specbits & 1 << (int) RID_SHORT))
3971 error ("long and short specified together for `%s'", name);
3972 else if (((specbits & 1 << (int) RID_LONG)
3973 || (specbits & 1 << (int) RID_SHORT))
3975 error ("long or short specified with char for `%s'", name);
3976 else if (((specbits & 1 << (int) RID_LONG)
3977 || (specbits & 1 << (int) RID_SHORT))
3978 && TREE_CODE (type) == REAL_TYPE)
3979 error ("long or short specified with floating type for `%s'", name);
3980 else if ((specbits & 1 << (int) RID_SIGNED)
3981 && (specbits & 1 << (int) RID_UNSIGNED))
3982 error ("signed and unsigned given together for `%s'", name);
3986 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
3988 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
3990 if (flag_pedantic_errors)
3995 /* Discard the type modifiers if they are invalid. */
3998 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3999 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4004 if ((specbits & (1 << (int) RID_COMPLEX))
4005 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4007 error ("complex invalid for `%s'", name);
4008 specbits &= ~ (1 << (int) RID_COMPLEX);
4011 /* Decide whether an integer type is signed or not.
4012 Optionally treat bitfields as signed by default. */
4013 if (specbits & 1 << (int) RID_UNSIGNED
4014 /* Traditionally, all bitfields are unsigned. */
4015 || (bitfield && flag_traditional
4016 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4017 || (bitfield && ! flag_signed_bitfields
4018 && (explicit_int || defaulted_int || explicit_char
4019 /* A typedef for plain `int' without `signed'
4020 can be controlled just like plain `int'. */
4021 || ! (typedef_decl != 0
4022 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4023 && TREE_CODE (type) != ENUMERAL_TYPE
4024 && !(specbits & 1 << (int) RID_SIGNED)))
4027 type = long_long_unsigned_type_node;
4028 else if (specbits & 1 << (int) RID_LONG)
4029 type = long_unsigned_type_node;
4030 else if (specbits & 1 << (int) RID_SHORT)
4031 type = short_unsigned_type_node;
4032 else if (type == char_type_node)
4033 type = unsigned_char_type_node;
4034 else if (typedef_decl)
4035 type = unsigned_type (type);
4037 type = unsigned_type_node;
4039 else if ((specbits & 1 << (int) RID_SIGNED)
4040 && type == char_type_node)
4041 type = signed_char_type_node;
4043 type = long_long_integer_type_node;
4044 else if (specbits & 1 << (int) RID_LONG)
4045 type = long_integer_type_node;
4046 else if (specbits & 1 << (int) RID_SHORT)
4047 type = short_integer_type_node;
4049 if (specbits & 1 << (int) RID_COMPLEX)
4051 /* If we just have "complex", it is equivalent to
4052 "complex double", but if any modifiers at all are specified it is
4053 the complex form of TYPE. E.g, "complex short" is
4054 "complex short int". */
4056 if (defaulted_int && ! longlong
4057 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4058 | (1 << (int) RID_SIGNED)
4059 | (1 << (int) RID_UNSIGNED))))
4060 type = complex_double_type_node;
4061 else if (type == integer_type_node)
4062 type = complex_integer_type_node;
4063 else if (type == float_type_node)
4064 type = complex_float_type_node;
4065 else if (type == double_type_node)
4066 type = complex_double_type_node;
4067 else if (type == long_double_type_node)
4068 type = complex_long_double_type_node;
4070 type = build_complex_type (type);
4073 /* Set CONSTP if this declaration is `const', whether by
4074 explicit specification or via a typedef.
4075 Likewise for VOLATILEP. */
4077 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4078 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4079 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4081 pedwarn ("duplicate `const'");
4083 pedwarn ("duplicate `volatile'");
4084 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4085 type = TYPE_MAIN_VARIANT (type);
4087 /* Warn if two storage classes are given. Default to `auto'. */
4092 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4093 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4094 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4095 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4096 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4097 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4099 /* Warn about storage classes that are invalid for certain
4100 kinds of declarations (parameters, typenames, etc.). */
4103 error ("multiple storage classes in declaration of `%s'", name);
4104 else if (funcdef_flag
4106 & ((1 << (int) RID_REGISTER)
4107 | (1 << (int) RID_AUTO)
4108 | (1 << (int) RID_TYPEDEF))))
4110 if (specbits & 1 << (int) RID_AUTO
4111 && (pedantic || current_binding_level == global_binding_level))
4112 pedwarn ("function definition declared `auto'");
4113 if (specbits & 1 << (int) RID_REGISTER)
4114 error ("function definition declared `register'");
4115 if (specbits & 1 << (int) RID_TYPEDEF)
4116 error ("function definition declared `typedef'");
4117 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4118 | (1 << (int) RID_AUTO));
4120 else if (decl_context != NORMAL && nclasses > 0)
4122 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4126 error ((decl_context == FIELD
4127 ? "storage class specified for structure field `%s'"
4128 : (decl_context == PARM
4129 ? "storage class specified for parameter `%s'"
4130 : "storage class specified for typename")),
4132 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4133 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4134 | (1 << (int) RID_EXTERN));
4137 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4139 /* `extern' with initialization is invalid if not at top level. */
4140 if (current_binding_level == global_binding_level)
4141 warning ("`%s' initialized and declared `extern'", name);
4143 error ("`%s' has both `extern' and initializer", name);
4145 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4146 && current_binding_level != global_binding_level)
4147 error ("nested function `%s' declared `extern'", name);
4148 else if (current_binding_level == global_binding_level
4149 && specbits & (1 << (int) RID_AUTO))
4150 error ("top-level declaration of `%s' specifies `auto'", name);
4151 else if ((specbits & 1 << (int) RID_ITERATOR)
4152 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4154 error ("iterator `%s' has derived type", name);
4155 type = error_mark_node;
4157 else if ((specbits & 1 << (int) RID_ITERATOR)
4158 && TREE_CODE (type) != INTEGER_TYPE)
4160 error ("iterator `%s' has noninteger type", name);
4161 type = error_mark_node;
4165 /* Now figure out the structure of the declarator proper.
4166 Descend through it, creating more complex types, until we reach
4167 the declared identifier (or NULL_TREE, in an absolute declarator). */
4169 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4171 if (type == error_mark_node)
4173 declarator = TREE_OPERAND (declarator, 0);
4177 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4178 an INDIRECT_REF (for *...),
4179 a CALL_EXPR (for ...(...)),
4180 an identifier (for the name being declared)
4181 or a null pointer (for the place in an absolute declarator
4182 where the name was omitted).
4183 For the last two cases, we have just exited the loop.
4185 At this point, TYPE is the type of elements of an array,
4186 or for a function to return, or for a pointer to point to.
4187 After this sequence of ifs, TYPE is the type of the
4188 array or function or pointer, and DECLARATOR has had its
4189 outermost layer removed. */
4191 if (TREE_CODE (declarator) == ARRAY_REF)
4193 register tree itype = NULL_TREE;
4194 register tree size = TREE_OPERAND (declarator, 1);
4195 /* An uninitialized decl with `extern' is a reference. */
4196 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4198 declarator = TREE_OPERAND (declarator, 0);
4200 /* Check for some types that there cannot be arrays of. */
4202 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4204 error ("declaration of `%s' as array of voids", name);
4205 type = error_mark_node;
4208 if (TREE_CODE (type) == FUNCTION_TYPE)
4210 error ("declaration of `%s' as array of functions", name);
4211 type = error_mark_node;
4214 if (size == error_mark_node)
4215 type = error_mark_node;
4217 if (type == error_mark_node)
4220 /* If this is a block level extern, it must live past the end
4221 of the function so that we can check it against other extern
4222 declarations (IDENTIFIER_LIMBO_VALUE). */
4223 if (extern_ref && allocation_temporary_p ())
4224 end_temporary_allocation ();
4226 /* If size was specified, set ITYPE to a range-type for that size.
4227 Otherwise, ITYPE remains null. finish_decl may figure it out
4228 from an initial value. */
4232 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4233 STRIP_TYPE_NOPS (size);
4235 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4236 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4238 error ("size of array `%s' has non-integer type", name);
4239 size = integer_one_node;
4241 if (pedantic && integer_zerop (size))
4242 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4243 if (TREE_CODE (size) == INTEGER_CST)
4245 constant_expression_warning (size);
4246 if (INT_CST_LT (size, integer_zero_node))
4248 error ("size of array `%s' is negative", name);
4249 size = integer_one_node;
4251 itype = build_index_type (size_binop (MINUS_EXPR, size,
4258 if (TREE_CONSTANT (size))
4259 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4261 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4263 itype = build_binary_op (MINUS_EXPR, size, integer_one_node,
4265 /* Make sure the array size remains visibly nonconstant
4266 even if it is (eg) a const variable with known value. */
4268 itype = variable_size (itype);
4269 itype = build_index_type (itype);
4273 #if 0 /* This had bad results for pointers to arrays, as in
4274 union incomplete (*foo)[4]; */
4275 /* Complain about arrays of incomplete types, except in typedefs. */
4277 if (TYPE_SIZE (type) == 0
4278 /* Avoid multiple warnings for nested array types. */
4279 && TREE_CODE (type) != ARRAY_TYPE
4280 && !(specbits & (1 << (int) RID_TYPEDEF))
4281 && !C_TYPE_BEING_DEFINED (type))
4282 warning ("array type has incomplete element type");
4285 #if 0 /* We shouldn't have a function type here at all!
4286 Functions aren't allowed as array elements. */
4287 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4288 && (constp || volatilep))
4289 pedwarn ("ANSI C forbids const or volatile function types");
4292 /* Build the array type itself, then merge any constancy or
4293 volatility into the target type. We must do it in this order
4294 to ensure that the TYPE_MAIN_VARIANT field of the array type
4295 is set correctly. */
4297 type = build_array_type (type, itype);
4298 if (constp || volatilep)
4299 type = c_build_type_variant (type, constp, volatilep);
4301 #if 0 /* don't clear these; leave them set so that the array type
4302 or the variable is itself const or volatile. */
4308 C_TYPE_VARIABLE_SIZE (type) = 1;
4310 else if (TREE_CODE (declarator) == CALL_EXPR)
4312 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4313 || current_binding_level == global_binding_level);
4316 /* Declaring a function type.
4317 Make sure we have a valid type for the function to return. */
4318 if (type == error_mark_node)
4323 /* Warn about some types functions can't return. */
4325 if (TREE_CODE (type) == FUNCTION_TYPE)
4327 error ("`%s' declared as function returning a function", name);
4328 type = integer_type_node;
4330 if (TREE_CODE (type) == ARRAY_TYPE)
4332 error ("`%s' declared as function returning an array", name);
4333 type = integer_type_node;
4336 #ifndef TRADITIONAL_RETURN_FLOAT
4337 /* Traditionally, declaring return type float means double. */
4339 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4340 type = double_type_node;
4341 #endif /* TRADITIONAL_RETURN_FLOAT */
4343 /* If this is a block level extern, it must live past the end
4344 of the function so that we can check it against other extern
4345 declarations (IDENTIFIER_LIMBO_VALUE). */
4346 if (extern_ref && allocation_temporary_p ())
4347 end_temporary_allocation ();
4349 /* Construct the function type and go to the next
4350 inner layer of declarator. */
4352 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4354 /* Say it's a definition
4355 only for the CALL_EXPR
4356 closest to the identifier. */
4357 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4358 #if 0 /* This seems to be false. We turn off temporary allocation
4359 above in this function if -traditional.
4360 And this code caused inconsistent results with prototypes:
4361 callers would ignore them, and pass arguments wrong. */
4363 /* Omit the arg types if -traditional, since the arg types
4364 and the list links might not be permanent. */
4365 type = build_function_type (type,
4367 ? NULL_TREE : arg_types);
4369 /* ANSI seems to say that `const int foo ();'
4370 does not make the function foo const. */
4371 if (constp || volatilep)
4372 type = c_build_type_variant (type, constp, volatilep);
4376 type = build_function_type (type, arg_types);
4377 declarator = TREE_OPERAND (declarator, 0);
4379 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4380 the formal parameter list of this FUNCTION_TYPE to point to
4381 the FUNCTION_TYPE node itself. */
4386 for (link = current_function_parm_tags;
4388 link = TREE_CHAIN (link))
4389 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4392 else if (TREE_CODE (declarator) == INDIRECT_REF)
4394 /* Merge any constancy or volatility into the target type
4397 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4398 && (constp || volatilep))
4399 pedwarn ("ANSI C forbids const or volatile function types");
4400 if (constp || volatilep)
4401 type = c_build_type_variant (type, constp, volatilep);
4406 type = build_pointer_type (type);
4408 /* Process a list of type modifier keywords
4409 (such as const or volatile) that were given inside the `*'. */
4411 if (TREE_TYPE (declarator))
4413 register tree typemodlist;
4415 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4416 typemodlist = TREE_CHAIN (typemodlist))
4418 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4420 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4425 error ("invalid type modifier within pointer declarator");
4429 pedwarn ("duplicate `const'");
4431 pedwarn ("duplicate `volatile'");
4434 declarator = TREE_OPERAND (declarator, 0);
4441 /* Now TYPE has the actual type. */
4443 /* If this is declaring a typedef name, return a TYPE_DECL. */
4445 if (specbits & (1 << (int) RID_TYPEDEF))
4448 /* Note that the grammar rejects storage classes
4449 in typenames, fields or parameters */
4450 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4451 && (constp || volatilep))
4452 pedwarn ("ANSI C forbids const or volatile function types");
4453 if (constp || volatilep)
4454 type = c_build_type_variant (type, constp, volatilep);
4456 decl = build_decl (TYPE_DECL, declarator, type);
4457 if ((specbits & (1 << (int) RID_SIGNED))
4458 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4459 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4463 /* Detect the case of an array type of unspecified size
4464 which came, as such, direct from a typedef name.
4465 We must copy the type, so that each identifier gets
4466 a distinct type, so that each identifier's size can be
4467 controlled separately by its own initializer. */
4469 if (type != 0 && typedef_type != 0
4470 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4471 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4473 type = build_array_type (TREE_TYPE (type), 0);
4475 C_TYPE_VARIABLE_SIZE (type) = 1;
4478 /* If this is a type name (such as, in a cast or sizeof),
4479 compute the type and return it now. */
4481 if (decl_context == TYPENAME)
4483 /* Note that the grammar rejects storage classes
4484 in typenames, fields or parameters */
4485 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4486 && (constp || volatilep))
4487 pedwarn ("ANSI C forbids const or volatile function types");
4488 if (constp || volatilep)
4489 type = c_build_type_variant (type, constp, volatilep);
4494 /* Aside from typedefs and type names (handle above),
4495 `void' at top level (not within pointer)
4496 is allowed only in public variables.
4497 We don't complain about parms either, but that is because
4498 a better error message can be made later. */
4500 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4501 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4502 && ((specbits & (1 << (int) RID_EXTERN))
4503 || (current_binding_level == global_binding_level
4505 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4507 error ("variable or field `%s' declared void",
4508 IDENTIFIER_POINTER (declarator));
4509 type = integer_type_node;
4512 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4513 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4518 if (decl_context == PARM)
4520 tree type_as_written = type;
4523 /* A parameter declared as an array of T is really a pointer to T.
4524 One declared as a function is really a pointer to a function. */
4526 if (TREE_CODE (type) == ARRAY_TYPE)
4528 /* Transfer const-ness of array into that of type pointed to. */
4529 type = TREE_TYPE (type);
4530 if (constp || volatilep)
4531 type = c_build_type_variant (type, constp, volatilep);
4532 type = build_pointer_type (type);
4533 volatilep = constp = 0;
4536 else if (TREE_CODE (type) == FUNCTION_TYPE)
4538 if (pedantic && (constp || volatilep))
4539 pedwarn ("ANSI C forbids const or volatile function types");
4540 if (constp || volatilep)
4541 type = c_build_type_variant (type, constp, volatilep);
4542 type = build_pointer_type (type);
4543 volatilep = constp = 0;
4546 decl = build_decl (PARM_DECL, declarator, type);
4548 C_DECL_VARIABLE_SIZE (decl) = 1;
4550 /* Compute the type actually passed in the parmlist,
4551 for the case where there is no prototype.
4552 (For example, shorts and chars are passed as ints.)
4553 When there is a prototype, this is overridden later. */
4555 DECL_ARG_TYPE (decl) = type;
4556 main_type = (type == error_mark_node
4558 : TYPE_MAIN_VARIANT (type));
4559 if (main_type == float_type_node)
4560 DECL_ARG_TYPE (decl) = double_type_node;
4561 /* Don't use TYPE_PRECISION to decide whether to promote,
4562 because we should convert short if it's the same size as int,
4563 but we should not convert long if it's the same size as int. */
4564 else if (TREE_CODE (main_type) != ERROR_MARK
4565 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4567 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4568 && TREE_UNSIGNED (type))
4569 DECL_ARG_TYPE (decl) = unsigned_type_node;
4571 DECL_ARG_TYPE (decl) = integer_type_node;
4574 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4576 else if (decl_context == FIELD)
4578 /* Structure field. It may not be a function. */
4580 if (TREE_CODE (type) == FUNCTION_TYPE)
4582 error ("field `%s' declared as a function",
4583 IDENTIFIER_POINTER (declarator));
4584 type = build_pointer_type (type);
4586 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4588 error ("field `%s' has incomplete type",
4589 IDENTIFIER_POINTER (declarator));
4590 type = error_mark_node;
4592 /* Move type qualifiers down to element of an array. */
4593 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4595 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4597 TYPE_DOMAIN (type));
4598 #if 0 /* Leave the field const or volatile as well. */
4599 constp = volatilep = 0;
4602 decl = build_decl (FIELD_DECL, declarator, type);
4604 C_DECL_VARIABLE_SIZE (decl) = 1;
4606 else if (TREE_CODE (type) == FUNCTION_TYPE)
4608 /* Every function declaration is "external"
4609 except for those which are inside a function body
4610 in which `auto' is used.
4611 That is a case not specified by ANSI C,
4612 and we use it for forward declarations for nested functions. */
4613 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4614 || current_binding_level == global_binding_level);
4616 if (specbits & (1 << (int) RID_AUTO)
4617 && (pedantic || current_binding_level == global_binding_level))
4618 pedwarn ("invalid storage class for function `%s'",
4619 IDENTIFIER_POINTER (declarator));
4620 if (specbits & (1 << (int) RID_REGISTER))
4621 error ("invalid storage class for function `%s'",
4622 IDENTIFIER_POINTER (declarator));
4623 /* Function declaration not at top level.
4624 Storage classes other than `extern' are not allowed
4625 and `extern' makes no difference. */
4626 if (current_binding_level != global_binding_level
4627 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4629 pedwarn ("invalid storage class for function `%s'",
4630 IDENTIFIER_POINTER (declarator));
4632 /* If this is a block level extern, it must live past the end
4633 of the function so that we can check it against other
4634 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4635 if (extern_ref && allocation_temporary_p ())
4636 end_temporary_allocation ();
4638 decl = build_decl (FUNCTION_DECL, declarator, type);
4640 if (pedantic && (constp || volatilep)
4641 && ! DECL_IN_SYSTEM_HEADER (decl))
4642 pedwarn ("ANSI C forbids const or volatile functions");
4645 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4646 warning ("`noreturn' function returns non-void value");
4649 DECL_EXTERNAL (decl) = 1;
4650 /* Record absence of global scope for `static' or `auto'. */
4652 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4653 /* Record presence of `inline', if it is reasonable. */
4656 tree last = tree_last (TYPE_ARG_TYPES (type));
4658 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4659 warning ("cannot inline function `main'");
4660 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4662 warning ("inline declaration ignored for function with `...'");
4664 /* Assume that otherwise the function can be inlined. */
4665 DECL_INLINE (decl) = 1;
4667 if (specbits & (1 << (int) RID_EXTERN))
4668 current_extern_inline = 1;
4673 /* It's a variable. */
4674 /* An uninitialized decl with `extern' is a reference. */
4675 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4677 /* Move type qualifiers down to element of an array. */
4678 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4680 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4682 TYPE_DOMAIN (type));
4683 #if 0 /* Leave the variable const or volatile as well. */
4684 constp = volatilep = 0;
4688 /* If this is a block level extern, it must live past the end
4689 of the function so that we can check it against other
4690 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4691 if (extern_ref && allocation_temporary_p ())
4692 end_temporary_allocation ();
4694 decl = build_decl (VAR_DECL, declarator, type);
4696 C_DECL_VARIABLE_SIZE (decl) = 1;
4699 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4701 DECL_EXTERNAL (decl) = extern_ref;
4702 /* At top level, the presence of a `static' or `register' storage
4703 class specifier, or the absence of all storage class specifiers
4704 makes this declaration a definition (perhaps tentative). Also,
4705 the absence of both `static' and `register' makes it public. */
4706 if (current_binding_level == global_binding_level)
4710 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4711 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4713 /* Not at top level, only `static' makes a static definition. */
4716 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4717 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4720 if (specbits & 1 << (int) RID_ITERATOR)
4721 ITERATOR_P (decl) = 1;
4724 /* Record `register' declaration for warnings on &
4725 and in case doing stupid register allocation. */
4727 if (specbits & (1 << (int) RID_REGISTER))
4728 DECL_REGISTER (decl) = 1;
4730 /* Record constancy and volatility. */
4733 TREE_READONLY (decl) = 1;
4736 TREE_SIDE_EFFECTS (decl) = 1;
4737 TREE_THIS_VOLATILE (decl) = 1;
4739 /* If a type has volatile components, it should be stored in memory.
4740 Otherwise, the fact that those components are volatile
4741 will be ignored, and would even crash the compiler. */
4742 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4743 mark_addressable (decl);
4751 /* Decode the parameter-list info for a function type or function definition.
4752 The argument is the value returned by `get_parm_info' (or made in parse.y
4753 if there is an identifier list instead of a parameter decl list).
4754 These two functions are separate because when a function returns
4755 or receives functions then each is called multiple times but the order
4756 of calls is different. The last call to `grokparms' is always the one
4757 that contains the formal parameter names of a function definition.
4759 Store in `last_function_parms' a chain of the decls of parms.
4760 Also store in `last_function_parm_tags' a chain of the struct, union,
4761 and enum tags declared among the parms.
4763 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4765 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4766 a mere declaration. A nonempty identifier-list gets an error message
4767 when FUNCDEF_FLAG is zero. */
4770 grokparms (parms_info, funcdef_flag)
4774 tree first_parm = TREE_CHAIN (parms_info);
4776 last_function_parms = TREE_PURPOSE (parms_info);
4777 last_function_parm_tags = TREE_VALUE (parms_info);
4779 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4780 && !in_system_header)
4781 warning ("function declaration isn't a prototype");
4784 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4787 pedwarn ("parameter names (without types) in function declaration");
4789 last_function_parms = first_parm;
4796 /* We no longer test FUNCDEF_FLAG.
4797 If the arg types are incomplete in a declaration,
4798 they must include undefined tags.
4799 These tags can never be defined in the scope of the declaration,
4800 so the types can never be completed,
4801 and no call can be compiled successfully. */
4803 /* In a fcn definition, arg types must be complete. */
4806 for (parm = last_function_parms, typelt = first_parm;
4808 parm = TREE_CHAIN (parm))
4809 /* Skip over any enumeration constants declared here. */
4810 if (TREE_CODE (parm) == PARM_DECL)
4812 /* Barf if the parameter itself has an incomplete type. */
4813 tree type = TREE_VALUE (typelt);
4814 if (TYPE_SIZE (type) == 0)
4816 if (funcdef_flag && DECL_NAME (parm) != 0)
4817 error ("parameter `%s' has incomplete type",
4818 IDENTIFIER_POINTER (DECL_NAME (parm)));
4820 warning ("parameter has incomplete type");
4823 TREE_VALUE (typelt) = error_mark_node;
4824 TREE_TYPE (parm) = error_mark_node;
4827 #if 0 /* This has been replaced by parm_tags_warning
4828 which uses a more accurate criterion for what to warn about. */
4831 /* Now warn if is a pointer to an incomplete type. */
4832 while (TREE_CODE (type) == POINTER_TYPE
4833 || TREE_CODE (type) == REFERENCE_TYPE)
4834 type = TREE_TYPE (type);
4835 type = TYPE_MAIN_VARIANT (type);
4836 if (TYPE_SIZE (type) == 0)
4838 if (DECL_NAME (parm) != 0)
4839 warning ("parameter `%s' points to incomplete type",
4840 IDENTIFIER_POINTER (DECL_NAME (parm)));
4842 warning ("parameter points to incomplete type");
4846 typelt = TREE_CHAIN (typelt);
4849 /* Allocate the list of types the way we allocate a type. */
4850 if (first_parm && ! TREE_PERMANENT (first_parm))
4852 /* Construct a copy of the list of types
4853 on the saveable obstack. */
4855 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4856 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4858 return nreverse (result);
4861 /* The list we have is permanent already. */
4867 /* Return a tree_list node with info on a parameter list just parsed.
4868 The TREE_PURPOSE is a chain of decls of those parms.
4869 The TREE_VALUE is a list of structure, union and enum tags defined.
4870 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4871 This tree_list node is later fed to `grokparms'.
4873 VOID_AT_END nonzero means append `void' to the end of the type-list.
4874 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4877 get_parm_info (void_at_end)
4880 register tree decl, t;
4881 register tree types = 0;
4883 tree tags = gettags ();
4884 tree parms = getdecls ();
4886 tree order = current_binding_level->parm_order;
4888 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4889 if (void_at_end && parms != 0
4890 && TREE_CHAIN (parms) == 0
4891 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4892 && DECL_NAME (parms) == 0)
4895 storedecls (NULL_TREE);
4896 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4897 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4900 /* Extract enumerator values and other non-parms declared with the parms.
4901 Likewise any forward parm decls that didn't have real parm decls. */
4902 for (decl = parms; decl; )
4904 tree next = TREE_CHAIN (decl);
4906 if (TREE_CODE (decl) != PARM_DECL)
4908 TREE_CHAIN (decl) = new_parms;
4911 else if (TREE_ASM_WRITTEN (decl))
4913 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4914 TREE_CHAIN (decl) = new_parms;
4920 /* Put the parm decls back in the order they were in in the parm list. */
4921 for (t = order; t; t = TREE_CHAIN (t))
4924 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4926 TREE_CHAIN (TREE_VALUE (t)) = 0;
4929 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4932 /* Store the parmlist in the binding level since the old one
4933 is no longer a valid list. (We have changed the chain pointers.) */
4934 storedecls (new_parms);
4936 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4937 /* There may also be declarations for enumerators if an enumeration
4938 type is declared among the parms. Ignore them here. */
4939 if (TREE_CODE (decl) == PARM_DECL)
4941 /* Since there is a prototype,
4942 args are passed in their declared types. */
4943 tree type = TREE_TYPE (decl);
4944 DECL_ARG_TYPE (decl) = type;
4945 #ifdef PROMOTE_PROTOTYPES
4946 if ((TREE_CODE (type) == INTEGER_TYPE
4947 || TREE_CODE (type) == ENUMERAL_TYPE)
4948 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4949 DECL_ARG_TYPE (decl) = integer_type_node;
4952 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4953 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4954 && DECL_NAME (decl) == 0)
4956 error ("`void' in parameter list must be the entire list");
4962 return saveable_tree_cons (new_parms, tags,
4963 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
4965 return saveable_tree_cons (new_parms, tags, nreverse (types));
4968 /* At end of parameter list, warn about any struct, union or enum tags
4969 defined within. Do so because these types cannot ever become complete. */
4972 parmlist_tags_warning ()
4977 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4979 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4980 /* An anonymous union parm type is meaningful as a GNU extension.
4981 So don't warn for that. */
4982 if (code == UNION_TYPE && !pedantic)
4984 if (TREE_PURPOSE (elt) != 0)
4985 warning ("`%s %s' declared inside parameter list",
4986 (code == RECORD_TYPE ? "struct"
4987 : code == UNION_TYPE ? "union"
4989 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4991 warning ("anonymous %s declared inside parameter list",
4992 (code == RECORD_TYPE ? "struct"
4993 : code == UNION_TYPE ? "union"
4998 warning ("its scope is only this definition or declaration,");
4999 warning ("which is probably not what you want.");
5005 /* Get the struct, enum or union (CODE says which) with tag NAME.
5006 Define the tag as a forward-reference if it is not defined. */
5009 xref_tag (code, name)
5010 enum tree_code code;
5013 int temporary = allocation_temporary_p ();
5015 /* If a cross reference is requested, look up the type
5016 already defined for this tag and return it. */
5018 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5019 /* Even if this is the wrong type of tag, return what we found.
5020 There will be an error message anyway, from pending_xref_error.
5021 If we create an empty xref just for an invalid use of the type,
5022 the main result is to create lots of superfluous error messages. */
5026 push_obstacks_nochange ();
5028 if (current_binding_level == global_binding_level && temporary)
5029 end_temporary_allocation ();
5031 /* If no such tag is yet defined, create a forward-reference node
5032 and record it as the "definition".
5033 When a real declaration of this type is found,
5034 the forward-reference will be altered into a real type. */
5036 ref = make_node (code);
5037 if (code == ENUMERAL_TYPE)
5039 /* (In ANSI, Enums can be referred to only if already defined.) */
5041 pedwarn ("ANSI C forbids forward references to `enum' types");
5042 /* Give the type a default layout like unsigned int
5043 to avoid crashing if it does not get defined. */
5044 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5045 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5046 TREE_UNSIGNED (ref) = 1;
5047 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5048 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5049 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5052 pushtag (name, ref);
5059 /* Make sure that the tag NAME is defined *in the current binding level*
5060 at least as a forward reference.
5061 CODE says which kind of tag NAME ought to be.
5063 We also do a push_obstacks_nochange
5064 whose matching pop is in finish_struct. */
5067 start_struct (code, name)
5068 enum tree_code code;
5071 /* If there is already a tag defined at this binding level
5072 (as a forward reference), just return it. */
5074 register tree ref = 0;
5076 push_obstacks_nochange ();
5077 if (current_binding_level == global_binding_level)
5078 end_temporary_allocation ();
5081 ref = lookup_tag (code, name, current_binding_level, 1);
5082 if (ref && TREE_CODE (ref) == code)
5084 C_TYPE_BEING_DEFINED (ref) = 1;
5085 if (TYPE_FIELDS (ref))
5086 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5087 : "redefinition of `struct %s'"),
5088 IDENTIFIER_POINTER (name));
5093 /* Otherwise create a forward-reference just so the tag is in scope. */
5095 ref = make_node (code);
5096 pushtag (name, ref);
5097 C_TYPE_BEING_DEFINED (ref) = 1;
5101 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5102 of a structure component, returning a FIELD_DECL node.
5103 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5105 This is done during the parsing of the struct declaration.
5106 The FIELD_DECL nodes are chained together and the lot of them
5107 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5110 grokfield (filename, line, declarator, declspecs, width)
5113 tree declarator, declspecs, width;
5117 /* The corresponding pop_obstacks is in finish_decl. */
5118 push_obstacks_nochange ();
5120 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5122 finish_decl (value, NULL_TREE, NULL_TREE);
5123 DECL_INITIAL (value) = width;
5125 maybe_objc_check_decl (value);
5129 /* Function to help qsort sort FIELD_DECLs by name order. */
5132 field_decl_cmp (x, y)
5135 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
5138 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5139 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5141 We also do a pop_obstacks to match the push in start_struct. */
5144 finish_struct (t, fieldlist)
5145 register tree t, fieldlist;
5149 int toplevel = global_binding_level == current_binding_level;
5151 /* If this type was previously laid out as a forward reference,
5152 make sure we lay it out again. */
5156 /* Nameless union parm types are useful as GCC extension. */
5157 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5158 /* Otherwise, warn about any struct or union def. in parmlist. */
5159 if (in_parm_level_p ())
5162 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5163 : "structure defined inside parms"));
5164 else if (! flag_traditional)
5165 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5166 : "structure defined inside parms"));
5169 old_momentary = suspend_momentary ();
5171 if (fieldlist == 0 && pedantic)
5172 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
5173 : "structure has no members"));
5175 /* Install struct as DECL_CONTEXT of each field decl.
5176 Also process specified field sizes.
5177 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5178 The specified size is found in the DECL_INITIAL.
5179 Store 0 there, except for ": 0" fields (so we can find them
5180 and delete them, below). */
5182 for (x = fieldlist; x; x = TREE_CHAIN (x))
5184 DECL_CONTEXT (x) = t;
5185 DECL_FIELD_SIZE (x) = 0;
5187 /* If any field is const, the structure type is pseudo-const. */
5188 if (TREE_READONLY (x))
5189 C_TYPE_FIELDS_READONLY (t) = 1;
5192 /* A field that is pseudo-const makes the structure likewise. */
5193 tree t1 = TREE_TYPE (x);
5194 while (TREE_CODE (t1) == ARRAY_TYPE)
5195 t1 = TREE_TYPE (t1);
5196 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5197 && C_TYPE_FIELDS_READONLY (t1))
5198 C_TYPE_FIELDS_READONLY (t) = 1;
5201 /* Any field that is volatile means variables of this type must be
5202 treated in some ways as volatile. */
5203 if (TREE_THIS_VOLATILE (x))
5204 C_TYPE_FIELDS_VOLATILE (t) = 1;
5206 /* Any field of nominal variable size implies structure is too. */
5207 if (C_DECL_VARIABLE_SIZE (x))
5208 C_TYPE_VARIABLE_SIZE (t) = 1;
5210 /* Detect invalid nested redefinition. */
5211 if (TREE_TYPE (x) == t)
5212 error ("nested redefinition of `%s'",
5213 IDENTIFIER_POINTER (TYPE_NAME (t)));
5215 /* Detect invalid bit-field size. */
5216 if (DECL_INITIAL (x))
5217 STRIP_NOPS (DECL_INITIAL (x));
5218 if (DECL_INITIAL (x))
5220 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5221 constant_expression_warning (DECL_INITIAL (x));
5224 error_with_decl (x, "bit-field `%s' width not an integer constant");
5225 DECL_INITIAL (x) = NULL;
5229 /* Detect invalid bit-field type. */
5230 if (DECL_INITIAL (x)
5231 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5232 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5234 error_with_decl (x, "bit-field `%s' has invalid type");
5235 DECL_INITIAL (x) = NULL;
5237 if (DECL_INITIAL (x) && pedantic
5238 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5239 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5240 /* Accept an enum that's equivalent to int or unsigned int. */
5241 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5242 && (TYPE_PRECISION (TREE_TYPE (x))
5243 == TYPE_PRECISION (integer_type_node))))
5244 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5246 /* Detect and ignore out of range field width. */
5247 if (DECL_INITIAL (x))
5249 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5251 if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node))
5253 DECL_INITIAL (x) = NULL;
5254 error_with_decl (x, "negative width in bit-field `%s'");
5256 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5257 || width > TYPE_PRECISION (TREE_TYPE (x)))
5259 DECL_INITIAL (x) = NULL;
5260 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5262 else if (width == 0 && DECL_NAME (x) != 0)
5264 error_with_decl (x, "zero width for bit-field `%s'");
5265 DECL_INITIAL (x) = NULL;
5269 /* Process valid field width. */
5270 if (DECL_INITIAL (x))
5272 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5274 DECL_FIELD_SIZE (x) = width;
5275 DECL_BIT_FIELD (x) = 1;
5276 DECL_INITIAL (x) = NULL;
5280 /* field size 0 => force desired amount of alignment. */
5281 #ifdef EMPTY_FIELD_BOUNDARY
5282 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5284 #ifdef PCC_BITFIELD_TYPE_MATTERS
5285 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5286 TYPE_ALIGN (TREE_TYPE (x)));
5292 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5293 : TYPE_ALIGN (TREE_TYPE (x)));
5294 /* Non-bit-fields are aligned for their type, except packed
5295 fields which require only BITS_PER_UNIT alignment. */
5296 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5300 /* Now DECL_INITIAL is null on all members. */
5302 /* Delete all duplicate fields from the fieldlist */
5303 for (x = fieldlist; x && TREE_CHAIN (x);)
5304 /* Anonymous fields aren't duplicates. */
5305 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5309 register tree y = fieldlist;
5313 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5319 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5321 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5322 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5324 else x = TREE_CHAIN (x);
5327 /* Now we have the nearly final fieldlist. Record it,
5328 then lay out the structure or union (including the fields). */
5330 TYPE_FIELDS (t) = fieldlist;
5334 /* Delete all zero-width bit-fields from the front of the fieldlist */
5336 && DECL_INITIAL (fieldlist))
5337 fieldlist = TREE_CHAIN (fieldlist);
5338 /* Delete all such members from the rest of the fieldlist */
5339 for (x = fieldlist; x;)
5341 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5342 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5343 else x = TREE_CHAIN (x);
5346 /* Now we have the truly final field list.
5347 Store it in this type and in the variants. */
5349 TYPE_FIELDS (t) = fieldlist;
5351 /* If there are lots of fields, sort so we can look through them fast.
5352 We arbitrarily consider 16 or more elts to be "a lot". */
5356 for (x = fieldlist; x; x = TREE_CHAIN (x))
5367 len += list_length (x);
5368 /* Use the same allocation policy here that make_node uses, to
5369 ensure that this lives as long as the rest of the struct decl.
5370 All decls in an inline function need to be saved. */
5371 if (allocation_temporary_p ())
5372 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5374 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5376 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5377 TYPE_LANG_SPECIFIC (t)->len = len;
5379 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5381 for (x = fieldlist; x; x = TREE_CHAIN (x))
5382 field_array[len++] = x;
5384 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5388 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5390 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5391 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5392 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5395 /* Promote each bit-field's type to int if it is narrower than that. */
5396 for (x = fieldlist; x; x = TREE_CHAIN (x))
5397 if (DECL_BIT_FIELD (x)
5398 && (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x))
5399 || DECL_FIELD_SIZE (x) < TYPE_PRECISION (integer_type_node)))
5401 tree type = TREE_TYPE (x);
5403 /* Preserve unsignedness if traditional
5404 or if not really getting any wider. */
5405 if (TREE_UNSIGNED (type)
5406 && (flag_traditional
5408 (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5410 DECL_FIELD_SIZE (x) == TYPE_PRECISION (integer_type_node))))
5411 TREE_TYPE (x) = unsigned_type_node;
5413 TREE_TYPE (x) = integer_type_node;
5416 /* If this structure or union completes the type of any previous
5417 variable declaration, lay it out and output its rtl. */
5419 if (current_binding_level->n_incomplete != 0)
5422 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5424 if (TREE_TYPE (decl) == t
5425 && TREE_CODE (decl) != TYPE_DECL)
5427 layout_decl (decl, 0);
5428 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5429 maybe_objc_check_decl (decl);
5430 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5433 --current_binding_level->n_incomplete;
5435 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5436 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5438 tree element = TREE_TYPE (decl);
5439 while (TREE_CODE (element) == ARRAY_TYPE)
5440 element = TREE_TYPE (element);
5442 layout_array_type (TREE_TYPE (decl));
5447 resume_momentary (old_momentary);
5449 /* Finish debugging output for this type. */
5450 rest_of_type_compilation (t, toplevel);
5452 /* The matching push is in start_struct. */
5458 /* Lay out the type T, and its element type, and so on. */
5461 layout_array_type (t)
5464 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5465 layout_array_type (TREE_TYPE (t));
5469 /* Begin compiling the definition of an enumeration type.
5470 NAME is its name (or null if anonymous).
5471 Returns the type object, as yet incomplete.
5472 Also records info about it so that build_enumerator
5473 may be used to declare the individual values as they are read. */
5479 register tree enumtype = 0;
5481 /* If this is the real definition for a previous forward reference,
5482 fill in the contents in the same object that used to be the
5483 forward reference. */
5486 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5488 /* The corresponding pop_obstacks is in finish_enum. */
5489 push_obstacks_nochange ();
5490 /* If these symbols and types are global, make them permanent. */
5491 if (current_binding_level == global_binding_level)
5492 end_temporary_allocation ();
5494 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5496 enumtype = make_node (ENUMERAL_TYPE);
5497 pushtag (name, enumtype);
5500 C_TYPE_BEING_DEFINED (enumtype) = 1;
5502 if (TYPE_VALUES (enumtype) != 0)
5504 /* This enum is a named one that has been declared already. */
5505 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5507 /* Completely replace its old definition.
5508 The old enumerators remain defined, however. */
5509 TYPE_VALUES (enumtype) = 0;
5512 enum_next_value = integer_zero_node;
5518 /* After processing and defining all the values of an enumeration type,
5519 install their decls in the enumeration type and finish it off.
5520 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5521 Returns ENUMTYPE. */
5524 finish_enum (enumtype, values)
5525 register tree enumtype, values;
5527 register tree pair, tem;
5528 tree minnode = 0, maxnode = 0;
5529 register HOST_WIDE_INT maxvalue = 0;
5530 register HOST_WIDE_INT minvalue = 0;
5532 unsigned precision = 0;
5533 int toplevel = global_binding_level == current_binding_level;
5534 int temporary = allocation_temporary_p ();
5536 if (in_parm_level_p ())
5537 warning ("enum defined inside parms");
5539 /* Calculate the maximum value of any enumerator in this type. */
5541 for (pair = values; pair; pair = TREE_CHAIN (pair))
5543 tree value = TREE_VALUE (pair);
5545 minnode = maxnode = TREE_VALUE (pair);
5548 if (tree_int_cst_lt (maxnode, value))
5550 if (tree_int_cst_lt (value, minnode))
5555 TYPE_MIN_VALUE (enumtype) = minnode;
5556 TYPE_MAX_VALUE (enumtype) = maxnode;
5558 /* Determine the precision this type needs. */
5560 if (TREE_INT_CST_HIGH (minnode) >= 0
5561 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5562 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5563 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5564 precision = TYPE_PRECISION (long_long_integer_type_node);
5567 maxvalue = TREE_INT_CST_LOW (maxnode);
5568 minvalue = TREE_INT_CST_LOW (minnode);
5571 precision = floor_log2 (maxvalue) + 1;
5574 /* Compute number of bits to represent magnitude of a negative value.
5575 Add one to MINVALUE since range of negative numbers
5576 includes the power of two. */
5577 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5578 if (negprecision > precision)
5579 precision = negprecision;
5580 precision += 1; /* room for sign bit */
5587 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5588 /* Use the width of the narrowest normal C type which is wide enough. */
5589 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5591 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5593 TYPE_SIZE (enumtype) = 0;
5594 layout_type (enumtype);
5596 /* An enum can have some negative values; then it is signed. */
5597 TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node);
5599 /* Change the type of the enumerators to be the enum type.
5600 Formerly this was done only for enums that fit in an int,
5601 but the comment said it was done only for enums wider than int.
5602 It seems necessary to do this for wide enums,
5603 and best not to change what's done for ordinary narrower ones. */
5604 for (pair = values; pair; pair = TREE_CHAIN (pair))
5606 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5607 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5608 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5609 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5612 /* Replace the decl nodes in VALUES with their names. */
5613 for (pair = values; pair; pair = TREE_CHAIN (pair))
5614 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5616 TYPE_VALUES (enumtype) = values;
5618 /* Fix up all variant types of this enum type. */
5619 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5621 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5622 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5623 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5624 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5625 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5626 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5627 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5628 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5631 /* Finish debugging output for this type. */
5632 rest_of_type_compilation (enumtype, toplevel);
5634 /* This matches a push in start_enum. */
5640 /* Build and install a CONST_DECL for one value of the
5641 current enumeration type (one that was begun with start_enum).
5642 Return a tree-list containing the CONST_DECL and its value.
5643 Assignment of sequential values by default is handled here. */
5646 build_enumerator (name, value)
5649 register tree decl, type;
5651 /* Validate and default VALUE. */
5653 /* Remove no-op casts from the value. */
5655 STRIP_TYPE_NOPS (value);
5659 if (TREE_CODE (value) == INTEGER_CST)
5661 value = default_conversion (value);
5662 constant_expression_warning (value);
5666 error ("enumerator value for `%s' not integer constant",
5667 IDENTIFIER_POINTER (name));
5672 /* Default based on previous value. */
5673 /* It should no longer be possible to have NON_LVALUE_EXPR
5677 value = enum_next_value;
5679 error ("overflow in enumeration values");
5682 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5684 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5685 value = integer_zero_node;
5688 /* Set basis for default for next value. */
5689 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5690 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5692 /* Now create a declaration for the enum value name. */
5694 type = TREE_TYPE (value);
5695 type = type_for_size (MAX (TYPE_PRECISION (type),
5696 TYPE_PRECISION (integer_type_node)),
5698 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5699 && TREE_UNSIGNED (type)));
5701 decl = build_decl (CONST_DECL, name, type);
5702 DECL_INITIAL (decl) = value;
5703 TREE_TYPE (value) = type;
5706 return saveable_tree_cons (decl, value, NULL_TREE);
5709 /* Create the FUNCTION_DECL for a function definition.
5710 DECLSPECS and DECLARATOR are the parts of the declaration;
5711 they describe the function's name and the type it returns,
5712 but twisted together in a fashion that parallels the syntax of C.
5714 This function creates a binding context for the function body
5715 as well as setting up the FUNCTION_DECL in current_function_decl.
5717 Returns 1 on success. If the DECLARATOR is not suitable for a function
5718 (it defines a datum instead), we return 0, which tells
5719 yyparse to report a parse error.
5721 NESTED is nonzero for a function nested within another function. */
5724 start_function (declspecs, declarator, nested)
5725 tree declarator, declspecs;
5728 tree decl1, old_decl;
5731 current_function_returns_value = 0; /* Assume, until we see it does. */
5732 current_function_returns_null = 0;
5733 warn_about_return_type = 0;
5734 current_extern_inline = 0;
5735 c_function_varargs = 0;
5737 shadowed_labels = 0;
5739 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5741 /* If the declarator is not suitable for a function definition,
5742 cause a syntax error. */
5746 announce_function (decl1);
5748 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5750 error ("return-type is an incomplete type");
5751 /* Make it return void instead. */
5753 = build_function_type (void_type_node,
5754 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5757 if (warn_about_return_type)
5758 warning ("return-type defaults to `int'");
5760 /* Save the parm names or decls from this function's declarator
5761 where store_parm_decls will find them. */
5762 current_function_parms = last_function_parms;
5763 current_function_parm_tags = last_function_parm_tags;
5765 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5766 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5767 DECL_INITIAL (decl1) = error_mark_node;
5769 /* If this definition isn't a prototype and we had a prototype declaration
5770 before, copy the arg type info from that prototype.
5771 But not if what we had before was a builtin function. */
5772 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5773 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5774 && !DECL_BUILT_IN (old_decl)
5775 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5776 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5777 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5779 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5780 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5781 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5784 /* Optionally warn of old-fashioned def with no previous prototype. */
5785 if (warn_strict_prototypes
5786 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5787 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5788 warning ("function declaration isn't a prototype");
5789 /* Optionally warn of any global def with no previous prototype. */
5790 else if (warn_missing_prototypes
5791 && TREE_PUBLIC (decl1)
5792 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5793 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5794 warning_with_decl (decl1, "no previous prototype for `%s'");
5795 /* Optionally warn of any def with no previous prototype
5796 if the function has already been used. */
5797 else if (warn_missing_prototypes
5798 && old_decl != 0 && TREE_USED (old_decl)
5799 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5800 warning_with_decl (decl1, "`%s' was used with no prototype before its definition");
5802 /* This is a definition, not a reference.
5803 So normally clear DECL_EXTERNAL.
5804 However, `extern inline' acts like a declaration
5805 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5806 DECL_EXTERNAL (decl1) = current_extern_inline;
5808 /* This function exists in static storage.
5809 (This does not mean `static' in the C sense!) */
5810 TREE_STATIC (decl1) = 1;
5812 /* A nested function is not global. */
5813 if (current_function_decl != 0)
5814 TREE_PUBLIC (decl1) = 0;
5816 /* Record the decl so that the function name is defined.
5817 If we already have a decl for this name, and it is a FUNCTION_DECL,
5818 use the old decl. */
5820 current_function_decl = pushdecl (decl1);
5823 declare_parm_level (1);
5824 current_binding_level->subblocks_tag_transparent = 1;
5826 make_function_rtl (current_function_decl);
5828 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5829 /* Promote the value to int before returning it. */
5830 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5832 /* It retains unsignedness if traditional
5833 or if not really getting wider. */
5834 if (TREE_UNSIGNED (restype)
5835 && (flag_traditional
5836 || (TYPE_PRECISION (restype)
5837 == TYPE_PRECISION (integer_type_node))))
5838 restype = unsigned_type_node;
5840 restype = integer_type_node;
5842 DECL_RESULT (current_function_decl)
5843 = build_decl (RESULT_DECL, NULL_TREE, restype);
5846 /* Allocate further tree nodes temporarily during compilation
5847 of this function only. */
5848 temporary_allocation ();
5850 /* If this fcn was already referenced via a block-scope `extern' decl
5851 (or an implicit decl), propagate certain information about the usage. */
5852 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5853 TREE_ADDRESSABLE (current_function_decl) = 1;
5858 /* Record that this function is going to be a varargs function.
5859 This is called before store_parm_decls, which is too early
5860 to call mark_varargs directly. */
5865 c_function_varargs = 1;
5868 /* Store the parameter declarations into the current function declaration.
5869 This is called after parsing the parameter declarations, before
5870 digesting the body of the function.
5872 For an old-style definition, modify the function's type
5873 to specify at least the number of arguments. */
5878 register tree fndecl = current_function_decl;
5881 /* This is either a chain of PARM_DECLs (if a prototype was used)
5882 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5883 tree specparms = current_function_parms;
5885 /* This is a list of types declared among parms in a prototype. */
5886 tree parmtags = current_function_parm_tags;
5888 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5889 register tree parmdecls = getdecls ();
5891 /* This is a chain of any other decls that came in among the parm
5892 declarations. If a parm is declared with enum {foo, bar} x;
5893 then CONST_DECLs for foo and bar are put here. */
5896 /* Nonzero if this definition is written with a prototype. */
5899 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5901 /* This case is when the function was defined with an ANSI prototype.
5902 The parms already have decls, so we need not do anything here
5903 except record them as in effect
5904 and complain if any redundant old-style parm decls were written. */
5915 error_with_decl (fndecl,
5916 "parm types given both in parmlist and separately");
5917 /* Get rid of the erroneous decls; don't keep them on
5918 the list of parms, since they might not be PARM_DECLs. */
5919 for (decl = current_binding_level->names;
5920 decl; decl = TREE_CHAIN (decl))
5921 if (DECL_NAME (decl))
5922 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5923 for (link = current_binding_level->shadowed;
5924 link; link = TREE_CHAIN (link))
5925 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5926 current_binding_level->names = 0;
5927 current_binding_level->shadowed = 0;
5930 specparms = nreverse (specparms);
5931 for (parm = specparms; parm; parm = next)
5933 next = TREE_CHAIN (parm);
5934 if (TREE_CODE (parm) == PARM_DECL)
5936 if (DECL_NAME (parm) == 0)
5937 error_with_decl (parm, "parameter name omitted");
5938 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5940 error_with_decl (parm, "parameter `%s' declared void");
5941 /* Change the type to error_mark_node so this parameter
5942 will be ignored by assign_parms. */
5943 TREE_TYPE (parm) = error_mark_node;
5949 /* If we find an enum constant or a type tag,
5950 put it aside for the moment. */
5951 TREE_CHAIN (parm) = 0;
5952 others = chainon (others, parm);
5956 /* Get the decls in their original chain order
5957 and record in the function. */
5958 DECL_ARGUMENTS (fndecl) = getdecls ();
5961 /* If this function takes a variable number of arguments,
5962 add a phony parameter to the end of the parm list,
5963 to represent the position of the first unnamed argument. */
5964 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5967 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5968 /* Let's hope the address of the unnamed parm
5969 won't depend on its type. */
5970 TREE_TYPE (dummy) = integer_type_node;
5971 DECL_ARG_TYPE (dummy) = integer_type_node;
5972 DECL_ARGUMENTS (fndecl)
5973 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5977 /* Now pushdecl the enum constants. */
5978 for (parm = others; parm; parm = next)
5980 next = TREE_CHAIN (parm);
5981 if (DECL_NAME (parm) == 0)
5983 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5985 else if (TREE_CODE (parm) != PARM_DECL)
5989 storetags (chainon (parmtags, gettags ()));
5993 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5994 each with a parm name as the TREE_VALUE.
5996 PARMDECLS is a chain of declarations for parameters.
5997 Warning! It can also contain CONST_DECLs which are not parameters
5998 but are names of enumerators of any enum types
5999 declared among the parameters.
6001 First match each formal parameter name with its declaration.
6002 Associate decls with the names and store the decls
6003 into the TREE_PURPOSE slots. */
6005 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6006 DECL_RESULT (parm) = 0;
6008 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6010 register tree tail, found = NULL;
6012 if (TREE_VALUE (parm) == 0)
6014 error_with_decl (fndecl, "parameter name missing from parameter list");
6015 TREE_PURPOSE (parm) = 0;
6019 /* See if any of the parmdecls specifies this parm by name.
6020 Ignore any enumerator decls. */
6021 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6022 if (DECL_NAME (tail) == TREE_VALUE (parm)
6023 && TREE_CODE (tail) == PARM_DECL)
6029 /* If declaration already marked, we have a duplicate name.
6030 Complain, and don't use this decl twice. */
6031 if (found && DECL_RESULT (found) != 0)
6033 error_with_decl (found, "multiple parameters named `%s'");
6037 /* If the declaration says "void", complain and ignore it. */
6038 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6040 error_with_decl (found, "parameter `%s' declared void");
6041 TREE_TYPE (found) = integer_type_node;
6042 DECL_ARG_TYPE (found) = integer_type_node;
6043 layout_decl (found, 0);
6046 /* Traditionally, a parm declared float is actually a double. */
6047 if (found && flag_traditional
6048 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6050 TREE_TYPE (found) = double_type_node;
6051 DECL_ARG_TYPE (found) = double_type_node;
6052 layout_decl (found, 0);
6055 /* If no declaration found, default to int. */
6058 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6060 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6061 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6062 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6064 warning_with_decl (found, "type of `%s' defaults to `int'");
6068 TREE_PURPOSE (parm) = found;
6070 /* Mark this decl as "already found" -- see test, above.
6071 It is safe to use DECL_RESULT for this
6072 since it is not used in PARM_DECLs or CONST_DECLs. */
6073 DECL_RESULT (found) = error_mark_node;
6076 /* Put anything which is on the parmdecls chain and which is
6077 not a PARM_DECL onto the list NONPARMS. (The types of
6078 non-parm things which might appear on the list include
6079 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6080 any actual PARM_DECLs not matched with any names. */
6083 for (parm = parmdecls; parm; )
6085 tree next = TREE_CHAIN (parm);
6086 TREE_CHAIN (parm) = 0;
6088 if (TREE_CODE (parm) != PARM_DECL)
6089 nonparms = chainon (nonparms, parm);
6092 /* Complain about args with incomplete types. */
6093 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6095 error_with_decl (parm, "parameter `%s' has incomplete type");
6096 TREE_TYPE (parm) = error_mark_node;
6099 if (DECL_RESULT (parm) == 0)
6101 error_with_decl (parm,
6102 "declaration for parameter `%s' but no such parameter");
6103 /* Pretend the parameter was not missing.
6104 This gets us to a standard state and minimizes
6105 further error messages. */
6107 = chainon (specparms,
6108 tree_cons (parm, NULL_TREE, NULL_TREE));
6115 /* Chain the declarations together in the order of the list of names. */
6116 /* Store that chain in the function decl, replacing the list of names. */
6118 DECL_ARGUMENTS (fndecl) = 0;
6121 for (last = 0; parm; parm = TREE_CHAIN (parm))
6122 if (TREE_PURPOSE (parm))
6125 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6127 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6128 last = TREE_PURPOSE (parm);
6129 TREE_CHAIN (last) = 0;
6133 /* If there was a previous prototype,
6134 set the DECL_ARG_TYPE of each argument according to
6135 the type previously specified, and report any mismatches. */
6137 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6140 for (parm = DECL_ARGUMENTS (fndecl),
6141 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6142 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6143 != void_type_node));
6144 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6146 if (parm == 0 || type == 0
6147 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6149 error ("number of arguments doesn't match prototype");
6150 error_with_file_and_line (current_function_prototype_file,
6151 current_function_prototype_line,
6152 "prototype declaration");
6155 /* Type for passing arg must be consistent
6156 with that declared for the arg. */
6157 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6159 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6160 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6162 /* Adjust argument to match prototype. E.g. a previous
6163 `int foo(float);' prototype causes
6164 `int foo(x) float x; {...}' to be treated like
6165 `int foo(float x) {...}'. This is particularly
6166 useful for argument types like uid_t. */
6167 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6168 #ifdef PROMOTE_PROTOTYPES
6169 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6170 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6171 && TYPE_PRECISION (TREE_TYPE (parm))
6172 < TYPE_PRECISION (integer_type_node))
6173 DECL_ARG_TYPE (parm) = integer_type_node;
6177 pedwarn ("promoted argument `%s' doesn't match prototype",
6178 IDENTIFIER_POINTER (DECL_NAME (parm)));
6179 warning_with_file_and_line
6180 (current_function_prototype_file,
6181 current_function_prototype_line,
6182 "prototype declaration");
6185 /* If -traditional, allow `int' argument to match
6186 `unsigned' prototype. */
6187 else if (! (flag_traditional
6188 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6189 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6191 error ("argument `%s' doesn't match prototype",
6192 IDENTIFIER_POINTER (DECL_NAME (parm)));
6193 error_with_file_and_line (current_function_prototype_file,
6194 current_function_prototype_line,
6195 "prototype declaration");
6199 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6202 /* Otherwise, create a prototype that would match. */
6206 register tree actual, type;
6207 register tree last = 0;
6209 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6211 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6214 TREE_CHAIN (last) = type;
6219 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6221 TREE_CHAIN (last) = type;
6225 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6226 of the type of this function, but we need to avoid having this
6227 affect the types of other similarly-typed functions, so we must
6228 first force the generation of an identical (but separate) type
6229 node for the relevant function type. The new node we create
6230 will be a variant of the main variant of the original function
6233 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6235 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6238 /* Now store the final chain of decls for the arguments
6239 as the decl-chain of the current lexical scope.
6240 Put the enumerators in as well, at the front so that
6241 DECL_ARGUMENTS is not modified. */
6243 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6246 /* Make sure the binding level for the top of the function body
6247 gets a BLOCK if there are any in the function.
6248 Otherwise, the dbx output is wrong. */
6250 keep_next_if_subblocks = 1;
6252 /* ??? This might be an improvement,
6253 but needs to be thought about some more. */
6255 keep_next_level_flag = 1;
6258 /* Write a record describing this function definition to the prototypes
6259 file (if requested). */
6261 gen_aux_info_record (fndecl, 1, 0, prototype);
6263 /* Initialize the RTL code for the function. */
6265 init_function_start (fndecl, input_filename, lineno);
6267 /* If this is a varargs function, inform function.c. */
6269 if (c_function_varargs)
6272 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6274 declare_function_name ();
6276 /* Set up parameters and prepare for return, for the function. */
6278 expand_function_start (fndecl, 0);
6280 /* If this function is `main', emit a call to `__main'
6281 to run global initializers, etc. */
6282 if (DECL_NAME (fndecl)
6283 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6284 && DECL_CONTEXT (fndecl) == NULL_TREE)
6285 expand_main_function ();
6288 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6289 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6290 stands for an ellipsis in the identifier list.
6292 PARMLIST is the data returned by get_parm_info for the
6293 parmlist that follows the semicolon.
6295 We return a value of the same sort that get_parm_info returns,
6296 except that it describes the combination of identifiers and parmlist. */
6299 combine_parm_decls (specparms, parmlist, void_at_end)
6300 tree specparms, parmlist;
6303 register tree fndecl = current_function_decl;
6306 tree parmdecls = TREE_PURPOSE (parmlist);
6308 /* This is a chain of any other decls that came in among the parm
6309 declarations. They were separated already by get_parm_info,
6310 so we just need to keep them separate. */
6311 tree nonparms = TREE_VALUE (parmlist);
6315 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6316 DECL_RESULT (parm) = 0;
6318 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6320 register tree tail, found = NULL;
6322 /* See if any of the parmdecls specifies this parm by name. */
6323 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6324 if (DECL_NAME (tail) == TREE_VALUE (parm))
6330 /* If declaration already marked, we have a duplicate name.
6331 Complain, and don't use this decl twice. */
6332 if (found && DECL_RESULT (found) != 0)
6334 error_with_decl (found, "multiple parameters named `%s'");
6338 /* If the declaration says "void", complain and ignore it. */
6339 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6341 error_with_decl (found, "parameter `%s' declared void");
6342 TREE_TYPE (found) = integer_type_node;
6343 DECL_ARG_TYPE (found) = integer_type_node;
6344 layout_decl (found, 0);
6347 /* Traditionally, a parm declared float is actually a double. */
6348 if (found && flag_traditional
6349 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6351 TREE_TYPE (found) = double_type_node;
6352 DECL_ARG_TYPE (found) = double_type_node;
6353 layout_decl (found, 0);
6356 /* If no declaration found, default to int. */
6359 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6361 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6362 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6363 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6364 error_with_decl (found, "type of parameter `%s' is not declared");
6368 TREE_PURPOSE (parm) = found;
6370 /* Mark this decl as "already found" -- see test, above.
6371 It is safe to use DECL_RESULT for this
6372 since it is not used in PARM_DECLs or CONST_DECLs. */
6373 DECL_RESULT (found) = error_mark_node;
6376 /* Complain about any actual PARM_DECLs not matched with any names. */
6378 for (parm = parmdecls; parm; )
6380 tree next = TREE_CHAIN (parm);
6381 TREE_CHAIN (parm) = 0;
6383 /* Complain about args with incomplete types. */
6384 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6386 error_with_decl (parm, "parameter `%s' has incomplete type");
6387 TREE_TYPE (parm) = error_mark_node;
6390 if (DECL_RESULT (parm) == 0)
6392 error_with_decl (parm,
6393 "declaration for parameter `%s' but no such parameter");
6394 /* Pretend the parameter was not missing.
6395 This gets us to a standard state and minimizes
6396 further error messages. */
6398 = chainon (specparms,
6399 tree_cons (parm, NULL_TREE, NULL_TREE));
6405 /* Chain the declarations together in the order of the list of names.
6406 At the same time, build up a list of their types, in reverse order. */
6412 for (last = 0; parm; parm = TREE_CHAIN (parm))
6413 if (TREE_PURPOSE (parm))
6416 parmdecls = TREE_PURPOSE (parm);
6418 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6419 last = TREE_PURPOSE (parm);
6420 TREE_CHAIN (last) = 0;
6422 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6427 return saveable_tree_cons (parmdecls, nonparms,
6428 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6430 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6433 /* Finish up a function declaration and compile that function
6434 all the way to assembler language output. The free the storage
6435 for the function definition.
6437 This is called after parsing the body of the function definition.
6439 NESTED is nonzero if the function being finished is nested in another. */
6442 finish_function (nested)
6445 register tree fndecl = current_function_decl;
6447 /* TREE_READONLY (fndecl) = 1;
6448 This caused &foo to be of type ptr-to-const-function
6449 which then got a warning when stored in a ptr-to-function variable. */
6452 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6454 /* Must mark the RESULT_DECL as being in this function. */
6456 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6458 /* Obey `register' declarations if `setjmp' is called in this fn. */
6459 if (flag_traditional && current_function_calls_setjmp)
6461 setjmp_protect (DECL_INITIAL (fndecl));
6462 setjmp_protect_args ();
6465 #ifdef DEFAULT_MAIN_RETURN
6466 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6468 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6469 != integer_type_node)
6470 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6473 /* Make it so that `main' always returns success by default. */
6474 DEFAULT_MAIN_RETURN;
6479 /* Generate rtl for function exit. */
6480 expand_function_end (input_filename, lineno, 0);
6482 /* So we can tell if jump_optimize sets it to 1. */
6485 /* Run the optimizers and output the assembler code for this function. */
6486 rest_of_compilation (fndecl);
6488 current_function_returns_null |= can_reach_end;
6490 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6491 warning ("`noreturn' function does return");
6492 else if (warn_return_type && can_reach_end
6493 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6494 /* If this function returns non-void and control can drop through,
6496 warning ("control reaches end of non-void function");
6497 /* With just -W, complain only if function returns both with
6498 and without a value. */
6499 else if (extra_warnings
6500 && current_function_returns_value && current_function_returns_null)
6501 warning ("this function may return with or without a value");
6503 /* Free all the tree nodes making up this function. */
6504 /* Switch back to allocating nodes permanently
6505 until we start another function. */
6507 permanent_allocation ();
6509 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6511 /* Stop pointing to the local nodes about to be freed. */
6512 /* But DECL_INITIAL must remain nonzero so we know this
6513 was an actual function definition. */
6514 /* For a nested function, this is done in pop_c_function_context. */
6515 /* If rest_of_compilation set this to 0, leave it 0. */
6516 if (DECL_INITIAL (fndecl) != 0)
6517 DECL_INITIAL (fndecl) = error_mark_node;
6518 DECL_ARGUMENTS (fndecl) = 0;
6523 /* Let the error reporting routines know that we're outside a
6524 function. For a nested function, this value is used in
6525 pop_c_function_context and then reset via pop_function_context. */
6526 current_function_decl = NULL;
6530 /* Save and restore the variables in this file and elsewhere
6531 that keep track of the progress of compilation of the current function.
6532 Used for nested functions. */
6536 struct c_function *next;
6538 tree shadowed_labels;
6541 int warn_about_return_type;
6543 struct binding_level *binding_level;
6546 struct c_function *c_function_chain;
6548 /* Save and reinitialize the variables
6549 used during compilation of a C function. */
6552 push_c_function_context ()
6554 struct c_function *p
6555 = (struct c_function *) xmalloc (sizeof (struct c_function));
6558 pedwarn ("ANSI C forbids nested functions");
6560 push_function_context ();
6562 p->next = c_function_chain;
6563 c_function_chain = p;
6565 p->named_labels = named_labels;
6566 p->shadowed_labels = shadowed_labels;
6567 p->returns_value = current_function_returns_value;
6568 p->returns_null = current_function_returns_null;
6569 p->warn_about_return_type = warn_about_return_type;
6570 p->extern_inline = current_extern_inline;
6571 p->binding_level = current_binding_level;
6574 /* Restore the variables used during compilation of a C function. */
6577 pop_c_function_context ()
6579 struct c_function *p = c_function_chain;
6582 /* Bring back all the labels that were shadowed. */
6583 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6584 if (DECL_NAME (TREE_VALUE (link)) != 0)
6585 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6586 = TREE_VALUE (link);
6588 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6590 /* Stop pointing to the local nodes about to be freed. */
6591 /* But DECL_INITIAL must remain nonzero so we know this
6592 was an actual function definition. */
6593 DECL_INITIAL (current_function_decl) = error_mark_node;
6594 DECL_ARGUMENTS (current_function_decl) = 0;
6597 pop_function_context ();
6599 c_function_chain = p->next;
6601 named_labels = p->named_labels;
6602 shadowed_labels = p->shadowed_labels;
6603 current_function_returns_value = p->returns_value;
6604 current_function_returns_null = p->returns_null;
6605 warn_about_return_type = p->warn_about_return_type;
6606 current_extern_inline = p->extern_inline;
6607 current_binding_level = p->binding_level;